new latex packages exsheets (12Oct)

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+--------------------------------------------------------------------------
+EXSHEETS v0.2b - 2012/10/08
+
+bundled packages:
+the EXSHEETS package
+  Yet another package for the creation of exercise sheets
+the TRANSLATIONS package
+  a simple translator
+the CNTFORMATS package
+  A different way to read counters.
+
+All mentioned packages are described in exsheets_en.pdf
+--------------------------------------------------------------------------
+Clemens Niederberger
+Web:    https://bitbucket.org/cgnieder/exsheets/
+E-Mail: contact@mychemistry.eu
+--------------------------------------------------------------------------
+Copyright 2011-2012 Clemens Niederberger
+
+This work may be distributed and/or modified under the
+conditions of the LaTeX Project Public License, either version 1.3
+of this license or (at your option) any later version.
+The latest version of this license is in
+  http://www.latex-project.org/lppl.txt
+and version 1.3 or later is part of all distributions of LaTeX
+version 2005/12/01 or later.
+
+This work has the LPPL maintenance status `maintained'.
+
+The Current Maintainer of this work is Clemens Niederberger.
+--------------------------------------------------------------------------
+The exsheets package consists of the files
+ - exsheets.sty, exsheets_headings.def, exsheets_headings.cfg,
+   exsheets_tasks.def, exsheets_tasks.cfg, exsheets_configurations.cfg,
+ - exsheets_en.tex, exsheets_en.pdf,
+ - README
+--------------------------------------------------------------------------
+The translations package consists of the files
+ - translations.sty
+--------------------------------------------------------------------------
+The cntformats package consists of the files
+ - cntformats.sty
+--------------------------------------------------------------------------
+If you have any ideas, questions, suggestions or bugs to report, please
+feel free to contact me.
+--------------------------------------------------------------------------
\ No newline at end of file
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+% arara: pdflatex
+% arara: biber
+% arara: pdflatex
+% arara: pdflatex
+% --------------------------------------------------------------------------
+% the EXSHEETS package
+% 
+%   Yet another package for the creation of exercise sheets
+% 
+% --------------------------------------------------------------------------
+% Clemens Niederberger
+% Web:    https://bitbucket.org/cgnieder/exsheets/
+% E-Mail: contact@mychemistry.eu
+% --------------------------------------------------------------------------
+% Copyright 2011-2012 Clemens Niederberger
+% 
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+% 
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Clemens Niederberger.
+% --------------------------------------------------------------------------
+% The exsheets package consists of the files
+%  - exsheets.sty, exsheets_headings.def, exsheets_headings.cfg,
+%    exsheets_tasks.def, exsheets_tasks.cfg, exsheets_configurations.cfg,
+%  - exsheets_en.tex, exsheets_en.pdf,
+%  - README
+% --------------------------------------------------------------------------
+% If you have any ideas, questions, suggestions or bugs to report, please
+% feel free to contact me.
+% --------------------------------------------------------------------------
+%
+% if you want to compile this documentation you'll need the document class
+% `cnpkgdoc' which you can get here:
+%    https://bitbucket.org/cgnieder/cnpkgdoc/
+% the class is licensed LPPL 1.3 or later
+%
+% use `xelatex' and `biber' for compilation
+%
+\RequirePackage{setspace}
+\documentclass[DIV10,toc=index,toc=bib,numbers=noendperiod]{cnpkgdoc}
+% ----------------------------------------------------------------------------
+% document layout and typographic features
+\docsetup{
+  pkg      = {[load-headings,load-tasks]exsheets} ,
+  url      = {https://bitbucket.org/cgnieder/exsheets/} ,
+  title    = ExSheets ,
+  name     = ExSheets ,
+  language = en ,
+  modules  = true ,
+  code-box = {
+    backgroundcolor  = gray!7!white ,
+    skipbelow        = .6\baselineskip plus .5ex minus .5ex ,
+    skipabove        = .6\baselineskip plus .5ex minus .5ex ,
+    innerleftmargin  = 1.5em ,
+    innerrightmargin = 2.5em
+  } ,
+  gobble   = 1
+}
+\cnpkgusecolorscheme{friendly}
+
+\usepackage{embrac}[2012/06/29]
+  \ChangeEmph{[}[,.02em]{]}[.055em,-.08em]
+  \ChangeEmph{(}[-.01em,.04em]{)}[.04em,-.05em]
+\usepackage{microtype}
+\usepackage[multiple]{fnpct}
+
+\renewcommand*\othersectionlevelsformat[3]{\textcolor{main}{#3\autodot}\enskip}
+\renewcommand*\partformat{\textcolor{main}{\partname~\thepart\autodot}}
+
+\pagestyle{headings}
+
+\setcapindent{1.5em}
+\setkomafont{caption}{\normalfont\footnotesize\sffamily}
+\setkomafont{captionlabel}{\normalfont\footnotesize\sffamily\scshape}
+
+\usepackage{booktabs,array,ragged2e}
+
+% ----------------------------------------------------------------------------
+% code examples
+% ExSheets:
+\addcmds{
+  acs, addpoints, blank, bigstar, bottomrule, citetitle, cmd, color,
+  DeclareInstance, DeclareTemplateInterface, DeclareQuestionProperty,
+  DebugExSheets, endspacing, GetQuestionProperty, grade, includequestions,
+  midrule, points, PrintIfIncludeActiveF, PrintIfIncludeActiveT,
+  PrintIfIncludeActiveTF, printsolutions, PrintSolutionsTF,
+  QuestionNumber, s, sample, setlength, SetQuestionProperties, SetupExSheets,
+  spacing, square, sumpoints, tabcolsep, task, textcite, textcolor, toprule,
+  totalpoints
+}
+
+% translations:
+\newcommand*\translations{{\scshape\textcolor{main}{translations}}\xspace}
+\addcmds{
+  cuisine, DeclareLanguage, DeclareLanguageAlias, DeclareTranslation,
+  GetTranslation, GetTranslationFor, kitchen, LoadDictionary,
+  LoadDictionaryFor, NewTranslation, ProvideDictionaryFor,
+  RenewTranslation, SaveTranslation, SaveTranslationFor, selectlanguage
+}
+
+% cntformats:
+\newcommand*\cntformats{{\scshape\textcolor{main}{cntformats}}\xspace}
+\addcmds{
+  @cntfmts@parsed@pattern, AddCounterPattern, eSaveCounterPattern,
+  NewCounterPattern, ReadCounterFrom, ReadCounterPattern,
+  ReadCounterPatternFrom, SaveCounterPattern, tmpa, tmpb
+}
+
+% ----------------------------------------------------------------------------
+% other packages, bibliography, index
+\usepackage{xcoffins,wasysym,enumitem,acro,booktabs,siunitx}
+\DeclareAcronym{id}{id}{Identifier}
+\DeclareAcronymFormat{id}{\scshape}
+
+\usepackage{filecontents}
+\begin{filecontents}{\jobname.ist}
+ heading_prefix "{\\bfseries "
+ heading_suffix "\\hfil}\\nopagebreak\n"
+ headings_flag  1
+ delim_0 "\\dotfill "
+ delim_1 "\\dotfill "
+ delim_2 "\\dotfill "
+ delim_r "\\textendash"
+ suffix_2p "\\nohyperpage{\\,f.}"
+ suffix_3p "\\nohyperpage{\\,ff.}"
+\end{filecontents}
+
+\usepackage{imakeidx}
+% \indexsetup{level=\section*}
+\makeindex[intoc,options={-sl \jobname.ist}]
+
+\usepackage{csquotes}
+\usepackage[backend=biber]{biblatex}
+\addbibresource{biblatex-examples.bib}
+\addbibresource{\jobname.bib}
+
+\begin{filecontents}{\jobname.bib}
+@package{answers,
+  title      = {answers},
+  author     = {Mike Piff},
+  maintainer = {Joseph Wright},
+  date       = {2010-10-11},
+  version    = {2.13},
+  url        = {http://www.ctan.org/pkg/answers/}
+}
+@package{enumitem,
+  title      = {enumitem},
+  author     = {Javier Bezos},
+  date       = {2011-09-28},
+  version    = {3.5.2},
+  url        = {http://www.ctan.org/pkg/enumitem/}
+}
+@package{exam,
+  title      = {exam},
+  author     = {Philip Hirschhorn},
+  date       = {2011-05-22},
+  version    = {2.4},
+  url        = {http://www.ctan.org/pkg/exam/}
+}
+@package{examdesign,
+  title      = {examdesign},
+  author     = {Jason Alexander},
+  date       = {2001-03-26},
+  version    = {1.1},
+  url        = {http://www.ctan.org/pkg/examdesign/}
+}
+@package{exercise,
+  title      = {exercise},
+  author     = {Paul Pichaureau},
+  date       = {2012-05-08},
+  version    = {1.58},
+  url        = {http://www.ctan.org/pkg/answers/}
+}
+@package{multienum,
+  title      = {multienum},
+  author     = {Dennis Kletzing},
+  date       = {2005-05-19},
+  version    = {n.n.},
+  url        = {http://www.ctan.org/pkg/multienum/}
+}
+@package{probsoln,
+  title      = {probsoln},
+  author     = {Nicola L. C. Talbot},
+  date       = {2011-12-10},
+  version    = {3.02},
+  url        = {http://www.ctan.org/pkg/probsolns/}
+}
+\end{filecontents}
+
+% ----------------------------------------------------------------------------
+% example definitions that have to be done in the preamble:
+\DeclareQuestionProperty{points}
+\DeclareQuestionProperty{notes}
+\DeclareQuestionProperty{reference}
+\DeclareQuestionProperty{topic}
+
+\DeclareRelGrades{
+  1     = 1 ,
+  {1,5} = .9167 ,
+  2     = .8333 ,
+  {2,5} = .75 ,
+  3     = .6667 ,
+  {3,5} = .5833 ,
+  4     = .5
+}
+
+\DeclareTranslation{English}{Kueche}{kitchen}
+\DeclareTranslation{German}{Kueche}{K\"uche}
+\DeclareTranslation{Spanish}{Kueche}{cocina}
+\DeclareTranslation{French}{Kueche}{cuisine}
+
+\usepackage{alphalph}
+\makeatletter
+\NewPatternFormat{aa}{\alphalph@alph}
+\makeatother
+\NewCounterPattern{testa}{ta}
+
+% ----------------------------------------------------------------------------
+% custom commands
+\newcommand*\Default[1]{%
+  \hfill\llap
+    {%
+      \ifblank{#1}%
+        {(initially~empty)}%
+        {Default:~\code{#1}}%
+    }%
+  \newline
+}
+\newcommand*\required{\hfill\llap{required}\newline}
+\newcommand*\optional{\hfill\llap{optional}\newline}
+
+\newcommand*\nooption[2]{\item[\code{\textcolor{key}{#1} = #2}] \cnpkgdocarrow\ }
+
+\newcommand*\unexpsign{$\RHD$}
+\newcommand*\expsign{\textcolor{red}{$\rhd$}}
+\renewcommand*\cnpkgdoctriangle{\unexpsign}
+\newcommand*\expandable{%
+  \def\cnpkgdoctriangle{%
+    \expsign
+    \gdef\cnpkgdoctriangle{\unexpsign}}}
+
+% ----------------------------------------------------------------------------
+% title page
+\TitlePicture{%
+  \parbox{.8\linewidth}{%
+    \ExSheets provides means to create exercises or questions and their
+    corresponding solutions. The questions can be divided into classes and/or
+    topics and can be printed selectively. Meta-data to questions can be added
+    and recovered.\par
+   The solutions may be printed where they are, can be collected and printed at
+   a later point in the document alltogether or section-wise or selectively by
+   \acs{id}.\par
+   \ExSheets provides a comprehensive interface for styling the headings of
+   questions and solutions.}}
+
+\begin{document}
+\part{Preliminary}\secidx{Preliminary}
+\section{Licence and Requirements}
+\secidx[Licence]{Preliminary}\secidx[Requirements]{Preliminary}
+\ExSheets is placed under the terms of the LaTeX Project Public License,
+version 1.3 or later (\url{http://www.latex-project.org/lppl.txt}).
+It has the status ``maintained.''
+
+\ExSheets loads and needs the following packages: \paket*{l3kernel},
+\paket{xparse}, \paket{xtemplate}, \paket{l3sort}, \paket{l3keys2e},
+\paket{xcolor}, \paket{ulem}, \paket{etoolbox}, \paket{environ}, \paket{lcg}
+and \paket{silence}. \ExSheets calls \cmd{normalem} (from the \paket{ulem} package).
+
+\section{Motivation}\secidx[Motivation]{Preliminary}
+There are already quite a number of packages that allow the creation of exercise
+sheets or written exams. Just to name the most common ones: \paket{exam}~\cite{exam},
+\paket{examdesign}~\cite{examdesign}, \paket{exercise}~\cite{exercise},
+\paket{probsoln}~\cite{probsoln}, \paket{answers}~\cite{answers} (and
+\href{http://www.ctan.org/characterization/primary/document-types/exams-exercise-sets-and-answers/}{many more}).
+
+One thing I missed in all packages that I've tried out\footnote{Well, probably I
+didn't try hard enough\ldots} was a high flexibility in choosing which questions
+and solutions should be printed, where which solutions should be printed and so
+on, combined with the possibility to assign questions to different classes so one
+could for example create two versions of an exam out of the box. And --~I can't
+get enough~-- I also want to be able to use/design different layouts for questions
+additional to a standard section-like format. All these points are realized in
+\ExSheets.
+
+Additionally one should be able to assign some sort of meta-data to questions
+that of course should be easily reusable. How this can be done is explained
+in section~\ref{sec:additional_info}.
+
+Then there is --~at least in Germany~-- the habit of having lists of exercises
+aligned in columns but counting from the left to the right instead from up to
+down. \ExSheets provides a possibility for that (see section~\ref{sec:tasks}).
+I am not quite content with it as it works now, though\footnote{There are still
+other possibilities, for example take a look here:
+\url{http://tex.stackexchange.com/questions/67966/enumerate-in-multicols} or at
+the \paket*{multienum} package~\cite{multienum}.}.
+
+On the other hand \ExSheets doesn't --~and probably won't~-- offer a real
+possibility for creating multiple choice questions. As a fact it doesn't provide
+many (if any) means to specify the \emph{type} of question or the structure. If
+these are your needs take a look at \paket{examdesign}, for example. Or exploit
+the possibilities \paket{enumitem}~\cite{enumitem} gives you.
+
+I had the idea for this package in 2008. Back then my \TeX\ skills were by far
+not good enough to write it. Actually, even today I wouldn't have been able to
+realize it without all the l3 packages like \paket*{l3kernel} and \paket*{l3packages}.
+I actively began to develop \ExSheets in spring 2011 but it wasn't until now
+(September 2012) that I consider it stable enough for wider usage. At the time
+of writing (\today) there still are probably lots of rough edges let alone bugs
+so I am very interested in all kinds of feedback.
+
+\section{Additional Packages}
+\ExSheets actually bundles three packages: \ExSheets, \translations and \cntformats.
+\translations is described in part~\ref{part:translations} and \cntformats in
+part~\ref{part:cntformats}. These two packages provide functionality that is used
+by \ExSheets. They can, however, be used independently from \ExSheets.
+
+\section{Installation}\secidx[Installation]{Preliminary}
+If you install \ExSheets manually beware to put the files
+\begin{itemize}
+ \item[]\verb+exsheets_headings.def+
+ \item[]\verb+exsheets_headings.cfg+
+ \item[]\verb+exsheets_tasks.def+
+ \item[]\verb+exsheets_tasks.cfg+
+\end{itemize}
+in the same directory as the \code{exsheets.sty} file\footnote{That is, a directory
+like \code{texmf-local/tex/latex/exsheets}, probably}. You \emph{can} install the
+other two packages, \translations and \cntformats, in different locations but since
+they belong to \ExSheets they probably should be placed in the same directory.
+
+As with every manual package installation you need to make sure to put the files
+in a directory where \TeX\ can find them and afterwards update the database.
+\secidx*{Preliminary}
+
+\part{The \ExSheets package}\label{part:exsheets}\secidx{\ExSheets}[ExSheets]
+\section{Package Usage}
+\subsection{Setup}\secidx{Setup}
+The \ExSheets package has three different types of options, kind of. The first
+type are the classic package options which are used when you load \ExSheets:
+\begin{beispiel}[code only]
+ \usepackage[<options>]{exsheets}
+\end{beispiel}
+These options are described in section~\ref{sec:options}.
+
+The second type are options that belong to a specific environment or command.
+These options are either used directly with the environment/command
+\begin{beispiel}[code only]
+ \begin{env}[<options>]
+  ...
+ \end{env}
+\end{beispiel}
+or can be set with the setup command:
+\begin{beschreibung}
+ \Befehl{SetupExSheets}[<module>]{<options>}
+\end{beschreibung}
+The options of the second type all belong to \textcolor{module}{\code{modules}}.
+Let's say you want to specify some options of the \code{question} environment.
+You can then say the following:
+\begin{beispiel}[code only]
+ \SetupExSheets[question]{option1,option2=value2}
+ % or:
+ \SetupExSheets{question/option1,question/option2=value2}
+\end{beispiel}
+The \textcolor{module}{\code{module}} an option belongs to is written in the left
+margin next to the when the option is described.
+
+The third type aren't options at all, actually. However, thanks to the great
+\paket{xtemplate} package you are able to define your own instances of some of
+the objects used be \ExSheets. This is explained in a little more detail in
+part~\ref{part:style} on page~\pageref{part:style}\,ff.
+\secidx*{Setup}
+
+\subsection{Package Options}\label{sec:options}\secidx{Package Options}
+The package \ExSheets has some options, namely the following ones:
+\begin{beschreibung}
+ %% color
+ \Option{color}{<colour>}\Default{exsheetsblue}
+   A custom colour that is used in certain but very rare circumstances.
+ %% counter-format
+ \Option{counter-format}{<counter-format>}\Default{qu.}
+   Formatting of the counter of the questions. This option takes a special kind
+   of string that is described in section~\ref{ssec:counter}.
+ \Option{counter-within}{<counter>}\Default{}
+   Resets the \code{question} counter with every step of \code{<counter>}.
+ %% headings
+ \Option{headings}{<instance>}\Default{block}
+   Choose the style of the questions' and solutions' headings. There are two
+   predefined styles: \code{block} and \code{runin}.
+ %% headings-format
+ \Option{headings-format}{<code>}\Default{\cmd{normalsize}\cmd{bfseries}}
+   This code is placed immediately before the headings of the questions and
+   solutions.
+ %% load-headings
+ \Option{load-headings}{\default{true}|false}\Default{false}
+   Loads additional styles for the headings. More on this is described in
+   section~\ref{sec:exsheets-headings}.
+ %% load-tasks
+ \Option{load-tasks}{\default{true}|false}\Default{false}
+   Loads additional styles for the \code{tasks} environment. See section~\ref{sec:tasks}.
+ %% totoc
+ \Option{totoc}{\default{true}|false}\Default{false}
+   This option adds the questions and solutions with their names and numbers to
+   the table of contents.
+ %% questions-totoc
+ \Option{questions-totoc}{\default{true}|false}\Default{false}
+   This option adds the questions with their names and numbers to the table of
+   contents.
+ %% solutions-totoc
+ \Option{solutions-totoc}{\default{true}|false}\Default{false}
+   This option adds the solutions with their names and numbers to the table of
+   contents.
+ %% toc-level
+ \Option{toc-level}{<toc level>}\Default{subsection}
+   This option sets the level in which questions and solutions should appear in
+   the table of contents.
+ %% questions-toc-level
+ \Option{questions-toc-level}{<toc level>}\Default{subsection}
+   This option sets the level in which questions should appear in the table of
+   contents.
+ %% solutions-toc-level
+ \Option{solutions-toc-level}{<toc level>}\Default{subsection}
+   This option sets the level in which solutions should appear in the table of
+   contents.
+ %% use-ref
+ \Option{use-ref}{\default{true}|false}\Default{false}
+   enable referencing to sections and chapters in a way that the references can
+   be used with \cmd{printsolutions}, see section~\ref{sssec:print_specific_section}
+   for details.
+\end{beschreibung}
+The \code{toc} options are demonstrated with section~\ref{sec:solutions:list} and
+the solutions printed there being listed in the table of contents.
+\secidx*{Package Options}
+
+\subsection{Create Questions/Exercises and their Solutions}
+Now, let's start with the most important part: the questions and (possibly) their
+respective solutions.
+\subsubsection{The \code{question} Environment}\label{ssec:questions}
+Questions are written inside the \code{question} environment:
+\begin{beschreibung}
+ \Umg{question}[<options>]{\unskip\ma{<points>} ... }
+\end{beschreibung}
+\begin{beispiel}
+ \begin{question}
+  This is our very first very difficult to solve question!
+ \end{question}
+\end{beispiel}
+As you can see a heading is automatically created and the question is numbered.
+You can of course change both the numbering and the naming, but more on that later.
+
+The \code{question} environment takes an optional argument \ma{<points>} that can
+be used to assign points to the question (as is common in written exams):
+\begin{beispiel}
+ \begin{question}{3}
+  This is our first difficult question that is worth 3 points!
+ \end{question}
+\end{beispiel}
+These points are saved internally (see section~\ref{sec:points} for reasons why)
+and are written to the right margin next to the question heading in the default
+setting.
+
+You can also assign bonus points by inserting \code{<point>+<bonus points>} as
+argument.
+\begin{beispiel}
+ \begin{question}{1+1}
+  This question is worth 1 point and 1 bonus point.
+ \end{question}
+ \begin{question}{+3}
+  This question is a bonus question. It is worth 3 bonus points.
+ \end{question}
+\end{beispiel}
+
+\subsubsection{Options to the \code{question} Environment}\secidx[options]{questions}
+The \code{question} environment takes one or more of the following options:
+\begin{beschreibung}
+ \Option[question]{type}{exam|exercise}\Default{exercise}
+   determines the type of question and changes the default name of a question
+   from ``Exercise'' to ``Question''. These default names are language dependent.\\
+   If you use \cmd*{usepackage}[ngerman]{babel}, for example, then the names
+   are ``\"Ubung and ``Aufgabe''.
+ \Option[question]{name}{<name>}\Default{}
+   sets a custom name. All predefined names are discarded.
+ \Option[question]{print}{\default{true}|false}\Default{true}
+   prints or hides the question.
+ \Option[question]{ID}{<id>}\Default{}
+   assigns a custom \acs{id} to the question. See section~\ref{ssec:ids} for further
+   information.
+ \Option[question]{class}{<class>}\Default{}
+   assigns a class to the question. See section~\ref{sec:classes} for further
+   information.
+ \Option[question]{topic}{<topic>}\Default{}
+   assigns a topic to the question. See section~\ref{sec:topics} for further
+   information.
+ \Option[question]{use}{\default{true}|false}\Default{true}
+   discards the question. Or not.
+\end{beschreibung}
+\begin{beispiel}
+ \begin{question}[type=exam]
+  This question has the type \texttt{exam}. The default name has changed from
+  ``Exercise'' to ``Question''.
+ \end{question}
+ \begin{question}[name=Fancy name]
+  This question has a custom name.
+ \end{question}
+ \begin{question}[print=false]
+  This question is not printed.
+ \end{question}
+\end{beispiel}
+
+The difference between \key{print} and \key{use} lies behind the scenes: with
+\key{print}{false} the question is not printed, but it still gets an individual
+ID, is numbered, and a possible solution is saved. This is for example useful
+when you want to print a sample solution for an exam. With \key{use}{false} it
+is fully discarded which means it is not accessible through an \acs{id} and a possible
+solution will not be saved.
+\secidx*{questions}
+
+\subsubsection{The \code{solution} Environment}\secidx{solutions}
+If you want to save/print (more on the exact usage in section~\ref{sec:solutions})
+a solution you have to use the \code{solution} environment \emph{after} the
+question it belongs to and \emph{before} the next question.
+\begin{beschreibung}
+ \Umg{solution}[<options>]{...}
+\end{beschreibung}
+\begin{beispiel}
+ \begin{question}[ID=first]\label{qu:question_with_solution}
+  This is our first question that gets a solution!
+ \end{question}
+ \begin{solution}
+  This is the solution to exercise~\ref{qu:question_with_solution}!
+ \end{solution}
+\end{beispiel}
+You can see that in the default settings the solution is \emph{not} written to the
+document. It has been saved, though, for possible later usage. We will see the
+solution later!
+
+\subsubsection{Options to the \code{solution} Environment}\secidx[options]{solutions}
+The \code{solutions} environment also has options, namely these:
+\begin{beschreibung}
+ \Option[solution]{name}{<name>}\Default{}
+   sets a custom name.
+ \Option[solution]{print}{\default{true}|false}\Default{false}
+   prints or hides the solution.
+\end{beschreibung}
+Their meaning is the same as those for the \code{question} environment.
+\begin{beispiel}
+ \begin{question}{5}
+  The solution to this questions gets printed where it is.
+ \end{question}
+ \begin{solution}[print]
+  See? This solution gets printed where you have put it in the code of
+  your document.
+ \end{solution}
+ \begin{question}{2.5}
+  The solution to this questions gets printed where it is \emph{and}
+  has a fancy name. Have you noticed that you can assign partial
+  points?
+ \end{question}
+ \begin{solution}[print,name=Fancy name]
+  See? This solution gets printed where you have put it and has a fancy
+  name!
+ \end{solution}
+\end{beispiel}
+\secidx*{solutions}
+
+\subsubsection{Setting the Counter}\label{ssec:counter}\secidx{Setting the Counter}
+The package option \key{counter-format} allows you to specify how
+the question counter is formatted.
+
+The input is an arbitrary string which means you can have anything as counter
+number. However, the letter combinations \code{ch}, \code{se}, \code{qu} and
+\code{tsk} are replaced with the counters for the chapter, section, question
+or tasks (see section~\ref{sec:tasks}), respectively. While the last one is not
+really useful in this case the others allow for a combined numbering. Each of
+these letter combinations can have an optional argument that specifies the format
+of the respective counter. \code{1}: \cmd{arabic}, \code{a}: \cmd{alph}, \code{A}:
+\cmd{Alph}, \code{r}: \cmd{roman} and \code{R}: \cmd{Roman}.
+\begin{beispiel}
+ \SetupExSheets{counter-format=Nr~se~(qu[a])}
+ \begin{question}
+  A question with a differently formatted number.
+ \end{question}
+\end{beispiel}
+\secidx*{Setting the Counter}
+
+\subsubsection{Language Settings}\secidx{Language Settings}
+The names of the questions and solutions are language dependent. If you use
+\paket{babel} or \paket{polyglossia} \ExSheets will adapt to the document
+language. Exsheets has a number of translations but surely not all! If you miss
+a language please drop me a line in an email%
+\footnote{\href{mailto:contact@mychemistry.eu}{contact@mychemistry.eu}}
+containing the \paket{babel} language name and the correct translations for
+questions (possibly distinguishing between exercises and exam questions) and
+solutions.
+
+Until I implement it you can add something like this to your preamble (example
+for Danish) and try if it works:
+\begin{beispiel}[code only]
+ \DeclareTranslation{Danish}{exsheets-exercise-name}
+   {\O{}velse}
+ \DeclareTranslation{Danish}{exsheets-question-name}
+   {Opgave}
+ \DeclareTranslation{Danish}{exsheets-solution-name}
+   {Opl\o{}sning}
+\end{beispiel}
+If this isn't working it means that the language you're using is unknown to
+the \translations package (see part~\ref{part:translations}). In this case please
+notify me, too. You then can still use the \key{name} options.
+\secidx*{Language Settings}
+
+\subsection{Counting Points}\label{sec:points}\secidx{Counting Points}
+\subsubsection{The Commands}
+You have seen in section~\ref{ssec:questions} that you can assign points to a
+question. If you do so these points are printed into the margin\footnote{Well,
+not necessarily. It depends on the heading style you have chosen.} and are counted
+internally. But there are additional commands to assign points or bonus points
+and a number of commands to retrieve the sum of points and/or bonus points.
+\begin{beschreibung}
+ \Befehl{addpoints}*{<num>}\newline
+   This command can be used to add points assigned to subquestions.
+   \cmd{addpoints} will print the points (with ``unit'') \emph{and} add them to
+   the sum of all points, \cmd{addpoints}* will only add them but print nothing.
+ \Befehl{points}*{<num>}\newline
+   This command will only print the points (with ``unit'') but won't add them
+   to the sum of points.
+ \Befehl{addbonus}*{<num>}\newline
+   This command can be used to add bonus points assigned to subquestions.
+   \cmd{addbonus} will print the points (with ``unit'') \emph{and} add them to
+   the sum of all bonus points, \cmd{addbonus}* will only add them but print nothing.
+ \Befehl{bonus}*{<num>}\newline
+   This command will only print the bonus points (with ``unit'') but won't add them
+   to the sum of bonus points.
+ \Befehl{pointssum}*\newline
+   Prints the sum of all points with or without (starred version) ``unit'':
+   \pointssum
+ \Befehl{currentpointssum}*\newline
+   Prints the current sum of points with or without (starred version) ``unit'':
+   \currentpointssum
+ \Befehl{bonussum}*\newline
+   Prints the sum of all bonus points with or without (starred version) ``unit'':
+   \bonussum
+ \Befehl{currentbonussum}*\newline
+   Prints the current sum of bonus points with or without (starred version) ``unit'':
+   \currentbonussum
+ \Befehl{totalpoints}*\newline
+   prints the sum of the points \emph{and} the sum of the bonus points with ``unit'':
+   \totalpoints
+   The starred version prints the sum of the points without ``unit'': \totalpoints*.
+\end{beschreibung}
+The last three commands need at least \emph{two} \LaTeX\ runs to get the sum right.
+
+Suppose you have an exercise worth \points{4} which consists of four questions
+listed with an \code{enumerate} environment that are all worth \points{1} each.
+You have two possibilities to display and count them:
+\begin{beispiel}
+ % uses package `enumitem'
+ \begin{question}{4}
+  \begin{enumerate}[label=\alph*)]
+   \item blah (\points{1})
+   \item blah (\points{1})
+   \item blah (\points{1})
+   \item blah (\points{1})
+  \end{enumerate}
+ \end{question}
+ \begin{question}
+  \begin{enumerate}[label=\alph*)]
+   \item blah (\addpoints{1})
+   \item blah (\addpoints{1})
+   \item blah (\addpoints{1})
+   \item blah (\addpoints{1})
+  \end{enumerate}
+ \end{question}
+\end{beispiel}
+
+\subsubsection{Options}\secidx[options]{Counting Points}
+\begin{beschreibung}
+ \Option[points]{name}{<name>}\Default{P.}
+   Choose the ``unit'' for the points. If you like to differentiate between a
+   single point and more than one point you can give a plural ending seperated
+   with a slash: \key{name}{point/s}. This sets also the name of the bonus points.
+ \Option[points]{name-plural}{<plural form of name>}\Default{}
+   Instead of forming the plural form with an ending to the singular form this
+   option allows to set an extra word for it. This sets also the plural form for
+   the bonus points.
+ \Option[points]{bonus-name}{<name>}\Default{P.}
+   Choose the ``unit'' for the bonus points. If you like to differentiate between a
+   single point and more than one point you can give a plural ending seperated
+   with a slash: \key{bonus-name}{point/s}.
+ \Option[points]{bonus-plural}{<plural form of name>}\Default{}
+   Instead of forming the plural form with an ending to the singular form this
+   option allows to set an extra word for it.
+ \Option[points]{use-name}{\default{true}|false}\Default{true}
+   Don't display the name at all. Or do.
+ \Option[points]{number-format}{<any code>}\Default{}
+   This option allows formatting of the number, \eg italics:
+   \key{number-format}{\cmd{textit}}.
+ \Option[points]{bonus-format}{<any code>}\Default{}
+   This option allows formatting of the number of the bonus points, \eg italics:
+   \key{bonus-format}{\cmd{textit}}.
+ \Option[points]{parse}{\default{true}|false}\Default{true}
+   If set to \code{false} the points are not counted and the \cmd{totalpoints},
+   \cmd{pointssum} and \cmd{bonussum} commands won't know their value.
+ \Option[points]{separate-bonus}{\default{true}|false}\Default{false}
+   This option determines whether points and bonus points each get their own
+   unit when they appear together (in the margin or with \cmd{totalpoints}).
+ \Option[points]{pre-bonus}{<tokens>}\Default{(+}
+   Code to be inserted before the bonus points when they follow normal points.
+ \Option[points]{post-bonus}{<tokens>}\Default{)}
+   Code to be inserted after the bonus points when they follow normal points.
+\end{beschreibung}
+\begin{beispiel}
+ \SetupExSheets[points]{name=point/s,number-format=\color{red}}
+ \begin{question}{1}
+  This one's easy so only 1 point can be earned.
+ \end{question}
+ \begin{question}{7.5}
+  But this one's hard! 7.5 points are in there for you!
+ \end{question}
+\end{beispiel}
+\secidx*{Counting Points}
+
+\subsection{A Grade Distribution}\secidx{Grade Distribution}
+Probably this is a rather esoteric feature but it could proof useful in some cases.
+Suppose you are a German math teacher and want to grade exactly corresponding to
+the number of points relative to the sum of total points, regardless of how big
+that might be. You could do something like this to present your grading decisions
+for the exam:
+\begin{beispiel}
+ % preamble:
+ % \DeclareRelGrades{
+ %   1     = 1 ,
+ %   {1,5} = .9167 ,
+ %   2     = .8333 ,
+ %   {2,5} = .75 ,
+ %   3     = .6667 ,
+ %   {3,5} = .5833 ,
+ %   4     = .5
+ % }
+ \small\setlength\tabcolsep{2pt}
+ \begin{tabular}{r|*8c}
+  Punkte
+    & $\grade*{1}$      & $\le\grade*{1}$ & $\le\grade*{1,5}$ & $\le\grade*{2}$
+    & $\le\grade*{2,5}$ & $\le\grade*{3}$ & $\le\grade*{3,5}$ & $<\grade*{4}$ \\
+  Note
+    & 1 & 1--2 & 2 & 2--3 & 3 & 3--4 & 4 & 5
+ \end{tabular}
+\end{beispiel}
+
+These are the available commands and options:
+\begin{beschreibung}
+ \Befehl{DeclareRelGrades}{<grade>=<num>,...}\newline
+   This command is used to define grades and assign the percentage of total
+   points to them.
+ \Befehl{grade}*{<grade>}\newline
+   Gives the number of points corresponding to a grade depending on the value
+   of \cmd{pointssum} with or without (starred version) ``unit''.
+ \Option[grades]{round}{<num>}\Default{0}
+   The number of decimals the points of a grade are rounded to. This doesn't apply
+   to the maximum number of points if the rounded number would be bigger than the
+   actual sum.
+ \Option[grades]{half}{\default{true}|false}\Default{false}
+   If set to \code{true} points are rounded either to full or to half points.
+\end{beschreibung}
+\secidx*{Grade Distribution}
+
+\subsection{Printing Solutions}\label{sec:solutions}\secidx[print]{solutions}
+You have already seen that you can print solutions where they are using the
+\key[solution]{print} option. But \ExSheets offers you quite more possibilities.
+
+In the next subsections the usage of the command
+\begin{beschreibung}
+ \Befehl{printsolutions}[<setting>]
+\end{beschreibung}
+is discussed.
+
+Before we do that a hint: remember that you can set the option \key{print} globally:
+\begin{beispiel}[code only]
+ % in the preamble
+ \SetupExSheets{solution/print=true}
+\end{beispiel}
+
+Now if you want to typeset some text depending on the option being true or not
+you can use the following commands:
+\begin{beschreibung}
+ \expandable\Befehl{PrintSolutionsTF}{<true code>}\ma{<false code>}
+ \expandable\Befehl{PrintSolutionsT}{<true code>}
+ \expandable\Befehl{PrintSolutionsF}{<false code>}
+\end{beschreibung}
+They might come in handy if you want two versions of an exercise sheet, one with
+the exercises and one with the solutions, and you want to add different titles
+to these versions, for instance.
+
+\subsubsection{Print all}\secidx[print!all]{solutions}
+The first and easiest usage of \cmd{printsolutions} is the following:
+\begin{beispiel}[code only]
+ \printsolutions
+\end{beispiel}
+There is nothing more to say, really. It prints all solutions you have specified
+except those belonging to a question with option \key{use}{false}. Yes, there's
+one more point: \cmd{printsolutions} only knows the solutions that have been set
+\emph{before} its usage! This is also true for every usage explained in the next
+sections.
+
+\begin{beispiel}[below]
+ \printsolutions
+\end{beispiel}
+
+\subsubsection{Print per chapter/section}\secidx[print!per section/chapter]{solutions}
+\minisec{Current chapter/section}
+If you are not creating an exercise sheet or an exam but are writing a textbook
+you maybe want a section at the end of each chapter showing the solution to the
+exercises presented in that chapter. In this case use the command as follows:
+\begin{beispiel}[code only]
+ \printsolutions[section]
+ % or
+ \printsolutions[chapter]
+\end{beispiel}
+Again, this is pretty much self-explaining. The solutions to the questions of the
+current chapter\footnote{Only if the document class you're using \emph{has}
+chapters, of course!} or section are printed.
+\begin{beispiel}
+ \begin{question}
+  This is the first and only question in this section.
+ \end{question}
+ \begin{solution}
+  This will be one of a few solutions printed by the following call of
+  \cmd{printsolutions}.
+ \end{solution}
+ And now:
+ \printsolutions[section]
+\end{beispiel}
+
+\minisec{Specific chapter/section}\label{sssec:print_specific_section}
+You can also print only the solutions from chapters or sections other than the
+current ones. The syntax is fairly easy:
+\begin{beispiel}[below]
+ \printsolutions[section={1-7,10}]
+ % the same for chapters:
+ % \printsolutions[chapter={1-7,10}]
+\end{beispiel}
+Don't forget that \cmd{printsolutions} cannot know the solutions from section~10
+yet. It is just used to demonstrate the syntax. You can also use an open range,
+\eg something like
+\begin{beispiel}[code only]
+ \printsolutions[section={-4,10-}]
+\end{beispiel}
+This would print the solutions from sections~1--4 and from all sections with
+number 10\footnote{Or rather where \cmd{value}{section} is 10 or greater -- the
+actual counter formatting is irrelevant.} and greater.
+
+There is an obvious disadvantage: you have to know the section numbers! But there
+is a solution: use the package option \key{use-ref}{true}. Then you can do something
+like
+\begin{beispiel}[code only]
+ % in the preamble:
+ \usepackage[use-ref]{exsheets}
+ % somewhere in your code after \section{A really cool section title}:
+ \label{sec:ReallyCool}
+ % somewhere later in your code:
+ \printsolutions[section={-\S{sec:ReallyCool}}]
+ % which will print all solutions from questions up to and
+ % including the really cool section
+\end{beispiel}
+With the package option \key{use-ref}{true} each usage of \cmd{label} will create
+additional labels (one preceded with \code{exse:} and another one with \code{exch:})
+which store the section number and the chapter number, respectively. These are used
+internally by two commands \cmd{S} and \cmd{C} which refer to the section number
+and the chapter number the label was created in. \emph{These commands are only
+available as arguments of} \cmd{printsolutions}.
+
+Since some packages like the well known \paket{hyperref} for example redefine
+\cmd{label} \key{use-ref} won't work in together with it. In this case don't
+use \key{use-ref} and set \cmd{exlabel}{<label>} instead to remember the
+section/the chapter number. Its usage is just like \cmd{label}. So the safest way
+is as follows:
+\begin{beispiel}[code only]
+ % in the preamble:
+ \usepackage{exsheets}
+ % somewhere in your code after \section{A really cool section title}:
+ \exlabel{sec:ReallyCool}
+ % somewhere later in your code:
+ \printsolutions[section={-\S{sec:ReallyCool}}]
+ % which will print all solutions from questions up to and
+ % including the really cool section
+\end{beispiel}
+Please be aware that the labels must be processed in a previous \LaTeX\ run before
+\cmd{S} and \cmd{C} can pass them on to \cmd{printsolutions}.
+
+\subsubsection{Print by \texorpdfstring{\acs{id}}{ID}}\label{ssec:ids}\secidx[print!by ID]{solutions}
+Now comes the best part: you can also print selected solutions! Every question
+has an \acs{id}. To see which \acs{id} a question has you can call the following command:
+\begin{beschreibung}
+ \Befehl{DebugExSheets}{true|false}
+\end{beschreibung}
+Let's create some more questions and take a look what this command does:
+\begin{beispiel}
+ \DebugExSheets{true}
+ \begin{question}[ID=nice!]
+  A question with a nice \acs{id}!
+ \end{question}
+ \begin{solution}
+  The solution to the question with the nice \acs{id}.
+ \end{solution}
+ \begin{question}{3.75}
+  Yet another question. But this time with quarter points!
+ \end{question}
+ \begin{solution}
+  Yet another solution.
+ \end{solution}
+\end{beispiel}
+
+So now we can call some specific solutions:
+\begin{beispiel}
+ \printsolutions[byID={first,nice!,10,14}]
+\end{beispiel}
+This makes use of the \paket{l3sort} package which at the time of writing is still
+considered experimental. In case you wonder where solution~14 is: question~14
+has no solution given.
+
+If you don't want that the solutions are sorted automatically but appear in the
+order given you can use the option
+\begin{beschreibung}
+ \Option[solution]{sorted}{\default{true}|false}\Default{true}
+   Sort solutions given by \acs{id} or don't.
+\end{beschreibung}
+
+\subsection{Using Classes}\label{sec:classes}\secidx{Classes}
+For creating different variants of a written exam or different difficulty levels
+of an exercise sheet it comes in handy if one can assign certain classes to questions
+and then tell \ExSheets only to use one ore more specific classes.
+\begin{beschreibung}
+ \Option{use-classes}{<list of classes>}\Default{}
+   When this option is used only the questions belonging to the specified classes
+   are printed and have their solutions saved.
+\end{beschreibung}
+\begin{beispiel}
+ \SetupExSheets{use-classes={easy,hard}}
+ \begin{question}[class=easy]
+  This one's easy.
+ \end{question}
+ \begin{question}[class=middle]
+  This one's a little bit harder.
+ \end{question}
+ \begin{question}[class=hard]
+  Let's see if you can solve this one!
+ \end{question}
+\end{beispiel}
+Questions of classes that are not used are fully discarded. \emph{This also means
+that questions that don't have a class assigned are discarded.}
+\secidx*{Classes}
+\ExplSyntaxOn
+ \bool_set_false:N \g__exsheets_use_classes_bool
+\ExplSyntaxOff
+
+\subsection{Using Topics}\label{sec:topics}\secidx{Topics}
+Similarly to classes one can assign topics to questions. The usage is practically
+identical, the semantic meaning is different.
+\begin{beschreibung}
+ \Option{use-topics}{<list of topics>}\Default{}
+   When this option is used only the questions belonging to the specified topics
+   are printed and have their solutions saved.
+\end{beschreibung}
+\begin{beispiel}
+ \SetupExSheets{use-topics={trigonometry}}
+ \begin{question}[topic=trigonometry]
+  A trigonometry question.
+ \end{question}
+ \begin{question}[topic=arithmetics]
+  A arithmetics question
+ \end{question}
+\end{beispiel}
+Questions of topics that are not used are fully discarded. \emph{This also means
+that questions that don't have a topic assigned are discarded.}
+
+If you set both \key{use-classes} and \key{use-topics} then only questions
+will be used that \emph{match both categories}.
+
+Ideally one could assign more than one topic to a question but this is \emph{not}
+supported yet.
+\secidx*{Topics}
+\ExplSyntaxOn
+ \bool_set_false:N \g__exsheets_use_topics_bool
+\ExplSyntaxOff
+
+\subsection{Adding and Using Additional Information to Questions}\label{sec:additional_info}
+\secidx{Additional Information to Questions}
+For managing lots of questions and corresponding solutions it can be very useful
+to be able to save and recover additional information to the questions. This is
+possible with the following commands. First the ones for saving:
+\begin{beschreibung}
+ \Befehl{DeclareQuestionProperty}{<name>}\newline
+   This command defines a question property \code{<name>}. It can only be used
+   in the document preamble.
+ \Befehl{SetQuestionProperties}{<name>=<value>,...}\newline
+   Set the properties for a specific question. this command can only be used
+   inside the \code{question} environment.
+\end{beschreibung}
+Now the commands for recovering the properties:
+\begin{beschreibung}
+ \Befehl{QuestionNumber}{<id>}\newline
+   Recover the number of the question with the \acs{id} \code{<id>}. The number
+   is displayed according to the format set with \key{counter-format}.
+ \Befehl{GetQuestionProperty}{<name>}\ma{<id>}\newline
+   Recover the property \code{<name>} of the question with the \acs{id} \code{<id>}.
+   Of course the property must have been declared before.
+\end{beschreibung}
+
+Let's say we have declared the properties \code{points}, \code{notes}, \code{reference}
+and \code{topic}. Then we can do the following:
+\begin{beispiel}
+ % uses `biblatex'
+ \begin{question}[ID=center,topic=LaTeX]{3}
+  Explain how you could center text in a \LaTeX\ document.
+  \SetQuestionProperties{
+    points    = 3,
+    topic     = \TeX/\LaTeX ,
+    notes     = {How to center text.},
+    reference = {\textcite{companion}}}
+ \end{question}
+ \begin{solution}
+  To center a short part of the text body one can use the \texttt{center}
+  environment (\points{1}). Inside an environment like \texttt{table} one
+  should use \texttt{\string\centering} (\points{1}). For single lines
+  there is also the \texttt{\string\centerline} command (\points{1}).
+ \end{solution}
+ \begin{question}[ID=knuthbooks,topic=LaTeX]{2}
+  Name two books by D.\,E.\,Knuth.
+  \SetQuestionProperties{
+    points    = 2,
+    topic     = \TeX/\LaTeX ,
+    notes     = {Books by Knuth.},
+    reference = {\textcite{knuth:ct:a,knuth:ct:b,knuth:ct:c,knuth:ct:d,knuth:ct:e}}}
+ \end{question}
+ \begin{solution}
+  For example two volumes from \citetitle{knuth:ct}:
+  \citetitle{knuth:ct:a,knuth:ct:b,knuth:ct:c,knuth:ct:d,knuth:ct:e}. Each valid
+  answer is worth \points{1}
+ \end{solution}
+\end{beispiel}
+
+It is now possible to recover these values later:
+\begin{beispiel}
+ % uses `booktabs'
+ \begin{center}
+  \begin{tabular}{lll}
+   \toprule
+    Question & Property & \\
+   \midrule
+    \QuestionNumber{center}
+      & Points     & \GetQuestionProperty{points}{center} \\
+      & Topic      & \GetQuestionProperty{topic}{center} \\
+      & References & \GetQuestionProperty{reference}{center} \\
+      & Note       & \GetQuestionProperty{notes}{center} \\
+   \midrule
+    \QuestionNumber{knuthbooks}
+      & Points     & \GetQuestionProperty{points}{knuthbooks} \\
+      & Topic      & \GetQuestionProperty{topic}{knuthbooks} \\
+      & References & \GetQuestionProperty{reference}{knuthbooks} \\
+      & Note       & \GetQuestionProperty{notes}{knuthbooks} \\
+   \bottomrule
+  \end{tabular}
+ \end{center}
+\end{beispiel}
+
+\secidx*{Additional Information to Questions}
+
+\subsection{Selectively Include Questions from External Files}\label{sec:include}
+\secidx{Include from External Files}
+Suppose you have one or more files with questions prepared to use them as a kind
+of database. One for class A, say, one for class B, one for class C and so one,
+something like this:
+\begin{beispiel}[code only]
+ % this is file classA.tex
+ \begin{question}[class=A,ID=A1,topic=X]
+  First question of class A, topic X.
+ \end{question}
+ \begin{solution}
+  First solution of class A.
+ \end{solution}
+ \begin{question}[class=A,ID=A2,topic=Y]
+  Second question of class A, topic Y.
+ \end{question}
+ \begin{solution}
+  Second solution of class A.
+ \end{solution}
+ ...
+ % end of file classA.tex
+ \endinput
+\end{beispiel}
+You can of course just \cmd{input} or \cmd{include} it but that would of course
+include the whole file into your document. But would't it be nice to just include
+selected questions? Or maybe a five random questions from the file? That is
+possible with the following command:
+\begin{beschreibung}
+ \Befehl{includequestions}[<options>]{<list of filenames>}
+\end{beschreibung}
+If you use it without options it will have the same effect as \cmd{input}. There
+are however the following options:
+\begin{beschreibung}
+ \Option[include]{all}{\default{true}|false}
+ \Option[include]{IDs}{<list of IDs>}\Default{}
+   Includes only the specified questions.
+ \Option[include]{random}{<num>}\Default{}
+   Includes \code{<num>} randomly selected questions. This option uses the
+   \paket{lcg} package to create the pseudo-random numbers.
+ \Option[include]{seed}{<num>}\Default{-1}
+   Sets the seed for the pseudo-random numbers.
+\end{beschreibung}
+The usage should be self-explainable:
+\begin{beispiel}[code only]
+ % include questions A1, A3 and A4:
+ \includequestions[IDs={A1,A3,A4}]{classA.tex}
+ % or include 3 random questions:
+ \includequestions[random=3]{classA}
+\end{beispiel}
+In order to be able to select the questions \ExSheets needs to \cmd{input} the
+file twice. The first time the available questions are detemined, the second time
+the selected questions are used. This unfortunately means that anything that is
+\emph{not} part of a question or solution is also input twice. Either don't do
+that or use one of the following commands for control:
+\begin{beschreibung}
+ \Befehl{PrintIfIncludeActiveTF}\ma{<true code>}\ma{<false code>}
+ \Befehl{PrintIfIncludeActiveT}\ma{<true code>}
+ \Befehl{PrintIfIncludeActiveF}\ma{<false code>}
+\end{beschreibung}
+
+If you use the \key{random} option you need to be aware of the following facts:
+the options \key{use-classes}, \key{use-topics} and \key{question/print} are not
+considered when selecting the questions which means you might end up with less
+questions included than you've specified. The option \key{question/use} is also
+not taken into consideration. In fact it is completely ignored and the questions
+are included anyway. I'm still not sure this is a feature or a bug\ldots
+\secidx*{Include from External Files}
+
+\subsection{The \code{tasks} Environment}\label{sec:tasks}\secidx{tasks}
+\subsubsection{How it works}
+The \code{tasks} environment is similar to a list like \code{enumerate} but not
+the same. The first difference: there is no pagebreak possible inside an item but
+only between items. The second difference: the enumeration default is a), b), c)
+\ldots The third difference: the input syntax:
+\begin{beschreibung}
+ \Umg{tasks}[<options>]{\unskip\ma{<num of columns>} list of tasks, each ended by
+ a semicolon}
+\end{beschreibung}
+Let's use some sample text in the next few examples:
+\begin{beispiel}[code only]
+ \def\s{This is some sample text we will use to create a somewhat longer text
+ spanning a few lines.}
+ \def\sample{\s\ \s\par\s}
+\end{beispiel}
+\def\s{This is some sample text we will use to create a somewhat longer text
+ spanning a few lines.}
+\def\sample{\s\ \s\par\s}
+\begin{beispiel}[below]
+ Some text before the list.
+ \begin{tasks}
+  \sample ;
+  \sample ;
+  \sample ;
+ \end{tasks}
+ And also some text after it.
+\end{beispiel}
+The environment takes the optional argument \ma{<num of columns>} with which the
+number of columns used by the environment is specified.
+\begin{beispiel}[below]
+ \begin{tasks}{2}
+  \sample ;
+  \s\ \s ;
+  \s ;
+  \sample ;
+  \s\par\s ;
+ \end{tasks}
+\end{beispiel}
+
+\subsubsection{Available Options}\secidx[Options]{tasks}
+The environment has some options, namely these:
+\begin{beschreibung}
+ \Option[tasks]{style}{<instance>}\Default{}
+   Choose the instance to be used. Read more on this in section~\ref{sec:exsheets-tasks}.
+ \Option[tasks]{label}{<label specs>}\Default{}
+   Sets a custom label. The letters \code{tsk} are replaced with the task-counter.
+   An optional argument directly following these letters specifies the counter format:
+   \code{1}: \cmd{arabic}, \code{a}: \cmd{alph}, \code{A}: \cmd{Alph}, \code{r}:
+   \cmd{roman} and \code{R}: \cmd{Roman}.
+ \Option[tasks]{label-width}{<dim>}\Default{3ex}
+   Sets the width of the item labels.
+ \Option[tasks]{before-skip}{<skip>}\Default{.33\cmd{baselineskip}}
+   Sets the skip before the list.
+ \Option[tasks]{after-skip}{<skip>}\Default{.33\cmd{baselineskip}}
+   Sets the skip after the list.
+\end{beschreibung}
+
+Now the same list as above but with three columns and a different label:
+\begin{beispiel}[below]
+ \begin{tasks}[label=(tsk[r]),label-width=4ex]{3}
+  \sample ;
+  \s\ \s ;
+  \s ;
+  \sample ;
+  \s\par\s ;
+ \end{tasks}
+\end{beispiel}
+
+Let's use it inside a question:
+\begin{beispiel}
+ \SetupExSheets[tasks]{label=qu.tsk,label-width=5ex}
+ \begin{question}[type=exam]{4}
+  I have these two tasks for you. Shall we begin?
+  \begin{tasks}{2}
+   The first task: easy! ;
+   The second task: even more so! ;
+  \end{tasks}
+ \end{question}
+ \begin{solution}[print]
+  Now, let's see\ldots\ ah, yes:
+  \begin{tasks}
+   This is the first solution. Told you it was easy. ;
+   This is the second solution. And of course you knew that! ;
+  \end{tasks}
+ \end{solution}
+\end{beispiel}
+
+\subsubsection{Available Instances}
+When you use the package option \key{load-tasks} there are currently three
+additional instances for the \code{tasks} are available:
+\begin{description}
+ \item[itemize] uses \cmd{labelitemi} as labels.
+ \item[enumerate] enumerates the items with 1., 2., \ldots
+ \item[multiplechoice] a --~well~-- `multiple choice' list.
+\end{description}
+\begin{beispiel}
+ \begin{tasks}[style=itemize]{2}
+  that's just how\ldots ;
+  \ldots we expected ;
+ \end{tasks}
+ \begin{tasks}[style=enumerate]{2}
+  that's just how\ldots ;
+  \ldots we expected ;
+ \end{tasks}
+ \begin{tasks}[style=multiplechoice]{2}
+  that's just how\ldots ;
+  \ldots we expected ;
+ \end{tasks}
+\end{beispiel}
+
+\subsubsection{Custom Labels}\secidx[Custom Labels]{tasks}
+If you want to change a single label inside a list, you can use
+\begin{beschreibung}
+ \Befehl{task}{<label>}
+\end{beschreibung}
+in one of the tasks. This will temporarily overwrite the default label.
+\begin{beispiel}
+ \begin{tasks}[style=itemize]
+  a standard item ;
+  another one ;
+  \task{+}a different one ;
+  and another one ;
+ \end{tasks}
+\end{beispiel}
+\secidx*{tasks}
+
+\subsection{Filling in the Blanks}\secidx{Blanks}
+Both in exercise sheets and in exams it is sometimes desirable to be able to
+create \blank{blanks} that have to be filled in. Or may be some more lines:
+\blank[width=5\linewidth]{}
+
+\begin{beschreibung}
+ \Befehl{blank}[<options>]{<text to be filled in>}\newline
+   creates a blank in normal text or in a question but fills the text of its
+   argument if inside a solution.
+\end{beschreibung}
+
+The options are these:
+\begin{beschreibung}
+ \Option[blank]{style}{line|wave|dline|dotted|dashed}\Default{line}
+   The style of the line.
+ \Option[blank]{width}{<dim>}\Default{}
+   The width of the line. If it is not used the width of the filled in text is used.
+\end{beschreibung}
+\begin{beispiel}
+ \begin{question}
+  Try to fill in \blank[width=4cm]{these} blanks. All of them
+  \blank[style=dotted]{are created} by using the \cmd{blank}
+  \blank[style=dashed]{command}.
+ \end{question}
+ \begin{solution}[print]
+  Try to fill in \blank[width=4cm]{these} blanks. All of them
+  \blank[style=dotted]{are created} by using the \cmd{blank}
+  \blank[style=dashed]{command}.
+ \end{solution}
+\end{beispiel}
+A number of empty lines are easily created by setting the width option:
+\begin{beispiel}
+ % \usepackage{setspace}
+ \spacing{2}\blank[width=4.8\linewidth]{}\endspacing
+\end{beispiel}
+\secidx*{Blanks}
+
+\section{Styling your Exercise/Exam Sheets}\label{part:style}
+\subsection{Background}
+The \ExSheets package makes extensive use of \LaTeX3's coffins\footnote{See the
+documentation to the \paket*{xcoffins} package for more information on that.} as
+well as its templates concept\footnote{Have a look into the documentation to the
+\paket*{xtemplate} package.}. The latter allows a rather easy extension and
+customization of some of \ExSheets' environments. To be more precise: you can
+define your own instances for the headings used for questions and solutions
+and for the \code{tasks} environment.
+
+What this package doesn't provide is changing the background of questions or
+framing them. But this is easily possible using the \paket{mdframed} package
+and its \cmd*{surroundwithmdframed} copmmand.
+
+\subsection{The \code{exsheets-headings} Object}\label{sec:exsheets-headings}
+\secidx{The `exsheets-headings' Object}
+\ExSheets defines the object \code{exsheets-headings} and one template for it,
+the `default' template. The package also defines two instances of this template,
+the `block' instance and the `runin' instance.
+
+\begin{beispiel}
+ \SetupExSheets{headings=block}
+ \begin{question}{1}
+  a `block' heading
+ \end{question}
+ \SetupExSheets{headings=runin}
+ \begin{question}{1}
+  a `runin' heading
+ \end{question}
+\end{beispiel}
+
+\subsubsection{Available Options}
+This section only lists the options that can be used when defining an instance
+of the `default' template. The following subsections will give loads of examples
+of their usage. The options are listed in the definition for the template interface:
+
+\begin{beispiel}[code only]
+ \DeclareTemplateInterface{exsheets-heading}{default}{3}
+  {
+    % option         : type      = default
+    runin            : boolean   = false ,
+    indent-first     : boolean   = false ,
+    toc-reversed     : boolean   = false ,
+    vscale           : real      = 1     ,
+    above            : length    = 2pt   ,
+    below            : length    = 2pt   ,
+    main             : tokenlist =       ,
+    pre-code         : tokenlist =       ,
+    post-code        : tokenlist =       ,
+    title-format     : tokenlist =       ,
+    title-pre-code   : tokenlist =       ,
+    title-post-code  : tokenlist =       ,
+    number-format    : tokenlist =       ,
+    number-pre-code  : tokenlist =       ,
+    number-post-code : tokenlist =       ,
+    points-format    : tokenlist =       ,
+    points-pre-code  : tokenlist =       ,
+    points-post-code : tokenlist =       ,
+    join             : tokenlist =       ,
+    attach           : tokenlist =
+  }
+\end{beispiel}
+
+
+Each heading is built with at most four coffins available with the names `main',
+`title', `number' and `points'. Those coffins place possibly the whole heading,
+the title, the question number and the assigned points. The only coffin that's
+always typeset is the `main' coffin, which is empty per default.
+
+Coffins can be joined (two become one, the first extends its bounding box to contain
+the second) using the following syntax:
+\begin{beispiel}[code only]
+ join = coffin1[handle11,handle12]coffin2[handle21,handle22](x-offset,y-offset)
+\end{beispiel}
+The syntax for attaching (two become one, the first does \emph{not} extend its
+bounding box around the second) the syntax is the same.
+
+More on coffin handles is described in the documentation for the \paket{xcoffins}.
+Figure~\ref{fig:handles} briefly demonstrates the available handle pairs.
+
+\begin{figure}[ht]
+ \centering
+ \parbox{4.5cm}{%
+   \NewCoffin\ExampleCoffin
+   \SetHorizontalCoffin\ExampleCoffin{\color{gray!30}\rule{4cm}{4cm}}%
+   \DisplayCoffinHandles\ExampleCoffin{blue}%
+ }
+ \caption{Available handles for a horizontal coffin.}\label{fig:handles}
+\end{figure}
+
+The following subsections will show all definitions of the instances available
+with the package option \key{load-headings} and how they look. This will hopefully
+give you enough ideas to create your own instance if you want to have another
+heading style than the ones available.
+
+Of you use the option \key{load-headings} each of the following instances is
+available through the option \key{headings}{<instance>}.
+
+\subsubsection{The `block' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{block}{default}
+  {
+    join             = { title[r,B]number[l,B](1ex,0pt) } ,
+    attach           =
+      {
+        main[l,vc]title[l,vc](0pt,0pt) ;
+        main[r,vc]points[l,vc](\marginparsep,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=block}
+\begin{question}{1}
+ A `block' heading. \sample
+\end{question}
+
+\subsubsection{The `runin' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{runin}{default}
+  {
+    runin            = true ,
+    number-post-code = \space ,
+    attach           =
+      { main[l,vc]points[l,vc](\linewidth+\marginparsep,0pt) } ,
+    join             =
+      {
+        main[r,vc]title[r,vc](0pt,0pt) ;
+        main[r,vc]number[l,vc](1ex,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=runin}
+\begin{question}{1}
+ A `runin' heading. \sample
+\end{question}
+
+\subsubsection{The `simple' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{simple}{default}
+  {
+    title-format     = \normalsize ,
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    attach           = { main[l,t]number[l,t](0pt,0pt) } ,
+    join             =
+      {
+        number[r,b]title[l,b](1ex,0pt) ;
+        main[l,b]points[l,t](1em,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=simple}
+\begin{question}{1}
+ A `simple' heading. \sample
+\end{question}
+
+\subsubsection{The `block-rev' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{block-rev}{default}
+  {
+    toc-reversed     = true ,
+    join             = { number[r,B]title[l,B](1ex,0pt) } ,
+    attach           =
+      {
+        main[l,vc]number[l,vc](0pt,0pt) ;
+        main[r,vc]points[l,vc](\marginparsep,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=block-rev}
+\begin{question}{1}
+ A `block-rev' heading. \sample
+\end{question}
+
+\subsubsection{The `block-wp' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{block-wp}{default}
+  {
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             =
+      {
+        title[r,B]number[l,B](1ex,0pt) ;
+        title[r,B]points[l,B](1ex,0pt)
+      } ,
+    attach           = { main[l,vc]title[l,vc](0pt,0pt) }
+  }
+\end{beispiel}
+\SetupExSheets{headings=block-wp}
+\begin{question}{1}
+ A `block-wp' heading. \sample
+\end{question}
+
+\subsubsection{The `block-wp-rev' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{block-wp-rev}{default}
+  {
+    toc-reversed     = true ,
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             =
+      {
+        number[r,B]title[l,B](1ex,0pt) ;
+        number[r,B]points[l,B](1ex,0pt)
+      } ,
+    attach           = { main[l,vc]number[l,vc](0pt,0pt) }
+  }
+\end{beispiel}
+\SetupExSheets{headings=block-wp-rev}
+\begin{question}{1}
+ A `block-wp-rev' heading. \sample
+\end{question}
+
+\subsubsection{The `block-nr' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{block-nr}{default}
+  {
+    attach           =
+      {
+        main[l,vc]number[l,vc](0pt,0pt) ;
+        main[r,vc]points[l,vc](\marginparsep,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=block-nr}
+\begin{question}{1}
+ A `block-nr' heading. \sample
+\end{question}
+
+\subsubsection{The `block-nr-wp' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{block-nr-wp}{default}
+  {
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             = { number[r,vc]points[l,vc](1ex,0pt) } ,
+    attach           = { main[l,vc]number[l,vc](0pt,0pt) }
+  }
+\end{beispiel}
+\SetupExSheets{headings=block-nr-wp}
+\begin{question}{1}
+ A `block-nr-wp' heading. \sample
+\end{question}
+
+\subsubsection{The `runin-rev' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{runin-rev}{default}
+  {
+    toc-reversed     = true ,
+    runin            = true ,
+    title-post-code  = \space ,
+    attach           =
+      { main[l,vc]points[l,vc](\linewidth+\marginparsep,0pt) } ,
+    join             =
+      {
+        main[r,vc]number[r,vc](0pt,0pt) ;
+        main[r,vc]title[l,vc](1ex,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=runin-rev}
+\begin{question}{1}
+ A `runin-rev' heading. \sample
+\end{question}
+
+\subsubsection{The `runin-wp' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{runin-wp}{default}
+  {
+    runin            = true ,
+    points-pre-code  = ( ,
+    points-post-code = )\space ,
+    join             =
+      {
+        main[r,vc]title[r,vc](0pt,0pt) ;
+        main[r,vc]number[l,vc](1ex,0pt) ;
+        main[r,vc]points[l,vc](1ex,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=runin-wp}
+\begin{question}{1}
+ A `runin-wp' heading. \sample
+\end{question}
+
+\subsubsection{The `runin-wp-rev' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{runin-wp-rev}{default}
+  {
+    toc-reversed     = true ,
+    runin            = true ,
+    points-pre-code  = ( ,
+    points-post-code = )\space ,
+    join             =
+      {
+        main[r,vc]number[r,vc](0pt,0pt) ;
+        main[r,vc]title[l,vc](1ex,0pt) ;
+        main[r,vc]points[l,vc](1ex,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=runin-wp-rev}
+\begin{question}{1}
+ A `runin-wp-rev' heading. \sample
+\end{question}
+
+\subsubsection{The `runin-nr' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{runin-nr}{default}
+  {
+    runin            = true ,
+    number-post-code = \space ,
+    attach           =
+      { main[l,vc]points[l,vc](\linewidth+\marginparsep,0pt) } ,
+    join             = { main[r,vc]number[l,vc](0pt,0pt) }
+  }
+\end{beispiel}
+\SetupExSheets{headings=runin-nr}
+\begin{question}{1}
+ A `runin-nr' heading. \sample
+\end{question}
+
+\subsubsection{The `runin-fixed-nr' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{runin-fixed-nr}{default}
+  {
+    runin            = true ,
+    number-pre-code  = \hbox to 2em \bgroup ,
+    number-post-code = \hfil\egroup ,
+    attach           =
+      { main[l,vc]points[l,vc](\linewidth+\marginparsep,0pt) } ,
+    join             = { main[r,vc]number[l,vc](0pt,0pt) }
+  }
+\end{beispiel}
+\SetupExSheets{headings=runin-fixed-nr}
+\begin{question}{1}
+ A `runin-fixed-nr' heading. \sample
+\end{question}
+
+\subsubsection{The `runin-nr-wp' Instance}
+\needspace{2\baselineskip}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{runin-nr-wp}{default}
+  {
+    runin            = true ,
+    points-pre-code  = ( ,
+    points-post-code = )\space ,
+    join             =
+      {
+        main[r,vc]number[l,vc](0pt,0pt) ;
+        main[r,vc]points[l,vc](1ex,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=runin-nr-wp}
+\begin{question}{1}
+ A `runin-nr-wp' heading. \sample
+\end{question}
+
+\subsubsection{The `centered' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{centered}{default}
+  {
+    join             = { title[r,B]number[l,B](1ex,0pt) } ,
+    attach           =
+      {
+        main[hc,vc]title[hc,vc](0pt,0pt) ;
+        main[r,vc]points[l,vc](\marginparsep,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=centered}
+\begin{question}{1}
+ A `centered' heading. \sample
+\end{question}
+
+\subsubsection{The `centered-wp' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{centered-wp}{default}
+  {
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             =
+      {
+        title[r,B]number[l,B](1ex,0pt) ;
+        title[r,B]points[l,B](1ex,0pt)
+      } ,
+    attach           = { main[hc,vc]title[hc,vc](0pt,0pt) }
+  }
+\end{beispiel}
+\SetupExSheets{headings=centered-wp}
+\begin{question}{1}
+ A `centered-wp' heading. \sample
+\end{question}
+
+\subsubsection{The `margin' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{margin}{default}
+  {
+    runin            = true ,
+    number-post-code = \space ,
+    points-pre-code  = ( ,
+    points-post-code = )\space ,
+    join             = { title[r,b]number[l,b](1ex,0pt) } ,
+    attach           =
+      {
+        main[l,vc]title[r,vc](0pt,0pt) ;
+        main[l,b]points[r,t](0pt,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=margin}
+\begin{question}{1}
+ A `margin' heading. \sample
+\end{question}
+
+\subsubsection{The `margin-nr' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{margin-nr}{default}
+  {
+    runin  = true ,
+    attach =
+      {
+        main[l,vc]number[r,vc](-1ex,0pt) ;
+        main[r,vc]points[l,vc](\linewidth+\marginparsep,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=margin-nr}
+\begin{question}{1}
+ A `margin-nr' heading. \sample
+\end{question}
+
+\subsubsection{The `raggedleft' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{raggedleft}{default}
+  {
+    join             = { title[r,B]number[l,B](1ex,0pt) } ,
+    attach           =
+      {
+        main[r,vc]title[r,vc](0pt,0pt) ;
+        main[r,vc]points[l,vc](\marginparsep,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=raggedleft}
+\begin{question}{1}
+ A `raggedleft' heading. \sample
+\end{question}
+
+\subsubsection{The `fancy' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{fancy}{default}
+  {
+    toc-reversed     = true ,
+    indent-first     = true ,
+    vscale           = 2 ,
+    pre-code         = \rule{\linewidth}{1pt} ,
+    post-code        = \rule{\linewidth}{1pt} ,
+    title-format     = \large\scshape\color{exsheetsred} ,
+    number-format    = \large\bfseries\color{exsheetsblue} ,
+    points-format    = \itshape ,
+    join             = { number[r,B] title[l,B] (1ex,0pt) } ,
+    attach           =
+      {
+        main[hc,vc]number[hc,vc](0pt,0pt) ;
+        main[l,vc]points[r,vc](-\marginparsep,0pt)
+      }
+  }
+\end{beispiel}
+\SetupExSheets{headings=fancy}
+\begin{question}{1}
+ A `fancy' heading. \sample
+\end{question}
+
+\subsubsection{The `fancy-wp' Instance}
+\begin{beispiel}[code only]
+ \DeclareInstance{exsheets-heading}{fancy-wp}{default}
+  {
+    toc-reversed     = true ,
+    indent-first     = true ,
+    vscale           = 2 ,
+    pre-code         = \rule{\linewidth}{1pt} ,
+    post-code        = \rule{\linewidth}{1pt} ,
+    title-format     = \large\scshape\color{exsheetsred} ,
+    number-format    = \large\bfseries\color{exsheetsblue} ,
+    points-format    = \itshape ,
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             =
+      {
+        number[r,B]title[l,B](1ex,0pt) ;
+        number[r,B]points[l,B](1ex,0pt)
+      } ,
+    attach           = { main[hc,vc]number[hc,vc](0pt,0pt) }
+  }
+\end{beispiel}
+\SetupExSheets{headings=fancy-wp}
+\begin{question}{1}
+ A `fancy-wp' heading. \sample
+\end{question}
+\secidx*{The `exsheets-headings' Object}
+
+\subsection{The \code{exsheets-tasks} Object}\label{sec:exsheets-tasks}
+\secidx{The `exsheets-tasks' Object}
+The second object that's defined by \ExSheets is the `exsheets-tasks' object.
+This time there are four instances available for the one template (again
+`default') that was defined.
+
+\subsubsection{Available Options}
+This section only lists the options that can be used when defining an instance
+of the `default' template. The following subsections will give some examples
+of their usage.
+
+\begin{beispiel}[code only]
+ \DeclareTemplateInterface{exsheets-tasks}{default}{3}
+  {
+    % option        : type      = default
+    enumerate       : boolean   = true           ,
+    label           : tokenlist                  ,
+    indent          : length    = 2.5em          ,
+    label-format    : tokenlist = tsk[a])        ,
+    label-width     : length    = 3ex            ,
+    after-item-skip : length    = 2ex
+  }
+\end{beispiel}
+
+\subsubsection{Predefined Instances}
+This is rather brief this time:
+\begin{beispiel}[code only]
+ % ALPHABETIZE: a) b) c)
+ \DeclareInstance{exsheets-tasks}{alphabetize}{default}{}
+ % available when `load-tasks=true':
+ % ITEMIZE:
+ \DeclareInstance{exsheets-tasks}{itemize}{default}
+   { enumerate    = false }
+ % ENUMERATE:
+ \DeclareInstance{exsheets-tasks}{enumerate}{default}
+   { label-format = tsk. }
+ % MULTIPLECHOICE:
+ \DeclareInstance{exsheets-tasks}{multiplechoice}{default}
+   {
+     enumerate    = false       ,
+     label        = \choicebox  ,
+   }
+\end{beispiel}
+\secidx*{The `exsheets-tasks' Object}
+
+\subsection{Load Custom Configurations}\secidx{Custom Configurations}
+If you have custom configurations you want to be loaded automatically then save
+them in a file \code{exsheets\_configurations.cfg}. If this file is present it
+will be loaded \cmd*{AtBeginDocument}.
+\secidx*{Custom Configurations}
+\secidx*{\ExSheets}[ExSheets]
+
+\part{The \translations package}\label{part:translations}\secidx{\translations}[translations]
+\section{Motivation}\secidx[Motivation]{\translations}[translations]
+I wrote this package when I was in need for an expandable version of
+\paket*{translator}'s \cmd{translate}. If you don't need that then there is no
+need whatsoever for this package as \paket*{translator} from the \paket{beamer}
+bundle provides all the functionality \translations does (except for:
+\paket{translator}'s \cmd{translate} isn't expandable, \cmd{GetTranslation} is.).
+
+\section{Usage}\secidx[Usage]{\translations}[translations]
+These are the commands provided by \translations:
+\begin{beschreibung}
+ \Befehl{DeclareLanguage}{<lang>}\newline
+   Declare a language that can be used by \translations. If the language already
+   exists it will be silently redefined. This command can only be used in the preamble.
+ \Befehl{DeclareLanguageAlias}{<lang2>}\ma{<lang1>}\newline
+   Declares \code{<lang2>} to be an alias of \code{<lang1>}. If \code{<lang1>}
+   doesn't exist yet a warning will be raised and it will be defined. This command
+   can only be used in the preamble.
+ \Befehl{NewTranslation}{<lang>}\ma{<key>}\ma{<translation>}\newline
+   Defines a translation of key \code{<key>} for the language \code{<lang>}.
+   An error will be raised if a translation of \code{<key>} already exists.
+   This command can only be used in the preamble.
+ \Befehl{RenewTranslation}{<lang>}\ma{<key>}\ma{<translation>}\newline
+   Redefines a translation of key \code{<key>} for the language \code{<lang>}.
+   An error will be raised if no translation of \code{<key>} exists.
+   This command can only be used in the preamble.
+ \Befehl{DeclareTranslation}{<lang>}\ma{<key>}\ma{<translation>}\newline
+   Defines a translation of key \code{<key>} for the language \code{<lang>}.
+   No error will be raised if a translation of \code{<key>} already exists.
+   This command can only be used in the preamble.
+ \expandable\Befehl{GetTranslationFor}{<lang>}\ma{<key>}\newline
+   Fetches and prints the translation of \code{<key>} for the language \code{<lang>}.
+   This command is expandable.
+ \expandable\Befehl{GetTranslation}{<key>}\newline
+   Fetches and prints the translation of \code{<key>} for the currently active
+   language (as for example set by \paket{babel}). This command is expandable.
+ \Befehl{SaveTranslationFor}{<cmd>}\ma{<lang>}\ma{<key>}\newline
+   Fetches and saves the translation of \code{<key>} for the language \code{<lang>}
+   in the macro \code{<cmd>}.
+ \Befehl{SaveTranslation}{<cmd>}\ma{<key>}\newline
+   Fetches and saves the translation of \code{<key>} or the currently active
+   language (as for example set by \paket{babel}) in the macro \code{<cmd>}.
+ \Befehl{LoadDictionary}{<name>}\newline
+   Loads a file named \code{<name>-<lang>.trsl} where \code{<lang>} corresponds
+   to the lowercase name of the current language as defined with
+   \cmd{DeclareLanguage}. This file should contain the translations for the
+   specified language.
+ \Befehl{LoadDictionaryFor}{<lang>}\ma{<name>}\newline
+   Loads a file named \code{<name>-<lang>.trsl}.
+\end{beschreibung}
+Quite a number of languages already are defined, either directly or via an alias.
+So, before you define a language you should take a look in \code{translations.sty}
+if the language doesn't already exist.
+
+Here is a small example of usage:
+\begin{beispiel}
+ % in the preamble:
+ % \DeclareTranslation{English}{Kueche}{kitchen}
+ % \DeclareTranslation{German}{Kueche}{K\"uche}
+ % \DeclareTranslation{Spanish}{Kueche}{cocina}
+ % \DeclareTranslation{French}{Kueche}{cuisine}
+ 
+ \GetTranslation{Kueche}
+ \SaveTranslation\kitchen{Kueche}
+ \SaveTranslationFor\cuisine{french}{Kueche}
+
+ \selectlanguage{ngerman}
+ \GetTranslation{Kueche} \kitchen\ \GetTranslationFor{spanish}{Kueche}
+ \cuisine
+\end{beispiel}
+
+A typical dictionary file should look as follows:
+\begin{beispiel}[code only]
+ % this is file housing-german.trsl
+ \ProvideDictionaryFor{german}{housing}[<version info>]
+ \DeclareTranslation{German}{kitchen (housing)}{K\"uche}
+ \DeclareTranslation{German}{bathroom (housing)}{Bad}
+ \DeclareTranslation{German}{living room (housing)}{Wohnzimmer}
+ \DeclareTranslation{German}{bedroom (housing)}{Schlafzimmer}
+ ...
+ \endinput
+\end{beispiel}
+\secidx*{\translations}[translations]
+
+\part{The \cntformats package}\label{part:cntformats}\secidx{\cntformats}[cntformats]
+\section{Motivation}\secidx[Motivation]{\cntformats}[cntformats]
+\cntformats provides a way to format counters with what I will call patterns.
+This does not in any way effect the usual \LaTeXe\ way of treating counters and
+does not use \cmd*{the<counter>} nor is it affected by the redefinition of them.
+
+This package is aimed at package or class authors and probably not very useful
+for document authors.
+
+\section{Example}\secidx[Example]{\cntformats}[cntformats]
+A use case typically looks as follows:
+\begin{beispiel}
+ \ReadCounterPattern{se.sse}
+\end{beispiel}
+where the key \code{se} stands for the current value of the \code{section} counter
+and \code{sse} for \code{subsection}, respectively. \code{se.sse} is an example
+for what will be called \emph{pattern}. The keys for the counters can have optional
+arguments that specify the format:
+\begin{beispiel}
+ \stepcounter{subsection}
+ \ReadCounterPattern{se[A](sse[r])}
+\end{beispiel}
+\code{A} stands for \cmd{Alph} and \code{r} for \cmd{roman}. A complete list can
+be found in table~\ref{tab:predefined:formats} on page~\pageref{tab:predefined:formats}.
+As you can see you can insert arbitrary other tokens in a pattern that won't be
+changed.
+
+\section{Usage}\secidx[Usage]{\cntformats}[cntformats]
+In order to make counters known to \cntformats the following commands are used:
+\begin{beschreibung}
+ \Befehl{AddCounterPattern}*[<module>]{<counter>}\ma{<pattern>}\newline
+   This command will make the (existing) counter \code{<counter>} known to
+   \cntformats and assign the pattern \code{<pattern>} to it.
+ \Befehl{NewCounterPattern}*[<module>]{<counter>}\ma{<pattern>}\newline
+   This command will create a new counter \code{<counter>}, make it known to
+   \cntformats and assign the pattern \code{<pattern>} to it.
+ \Befehl{ReadCounterFrom}[<module>]{<counter>}\ma{<internal cmd>}\newline
+   If you use one of the commands above with the starred version the number for
+   the pattern is not automatically fetched from the internal \cmd*{c@<counter>}.
+   This can now be assigned with \cmd{ReadCounterFrom} where \code{<internal cmd>}
+   is the macro that holds the number.
+\end{beschreibung}
+The commands above can only be used in the document preamble.
+
+After the creation of these pattern markers one wants to be able to use them.
+There are a number of macros that allow different aspects of usage.
+\begin{beschreibung}
+ \Befehl{ReadCounterPattern}[<module>]{<pattern>}\newline
+   Reads, interprets and prints a pattern.
+ \expandable\Befehl{@cntfmts@parsed@pattern}\newline
+   After \cmd{ReadCounterPattern} has been used the current pattern interpretation
+   is stored in this macro. The \emph{interpretation} is \emph{not} what is printed.
+   See the examples below for details.
+ \Befehl{ReadCounterPatternFrom}[<module>]{<macro that holds pattern>}\newline
+   Reads, interprets and prints a pattern that's stored in a macro.\\
+   Otherwise the same as \cmd{ReadCounterPattern}.
+ \Befehl{SaveCounterPattern}{<cmd a>}\ma{<cmd b>}\ma{<pattern>}\newline
+   Saves the \code{<pattern>} in \code{<cmd a>} and the interpreted pattern in
+   \code{<cmd b>}.
+ \Befehl{eSaveCounterPattern}[<module>]{<cmd a>}\ma{<cmd b>}\ma{<pattern>}\newline
+   Saves the \code{<pattern>} in \code{<cmd a>} and the expanded pattern in
+   \code{<cmd b>}.
+ \Befehl{SaveCounterPatternFrom}[<module>]{<cmd a>}\ma{<cmd b>}\ma{<macro that
+   holds pattern>}\newline
+   Like \cmd{SaveCounterPattern} but reads the pattern from a macro.
+ \Befehl{eSaveCounterPatternFrom}[<module>]{<cmd a>}\ma{<cmd b>}\ma{<macro that
+   holds pattern>}\newline
+   Like \cmd{eSaveCounterPattern} but reads the pattern from a macro.
+\end{beschreibung}
+
+The optional argument \code{<module>} should be specific for a package, say, so
+that different patterns for the \code{section} for example don't interfer with
+each other. If you leave the argument the default module \code{cntfmts} is used.
+
+The \ExSheets packages uses the commands with the module \code{exsheets}.
+You can find the following lines in \ExSheets' code:
+\begin{beispiel}[code only]
+ \AddCounterPattern*[exsheets]{section}{se}
+ \ReadCounterFrom[exsheets]{section}
+   \l__exsheets_counter_sec_int
+
+ \NewCounterPattern*[exsheets]{question}{qu}
+ \ReadCounterFrom[exsheets]{question}
+   \l__exsheets_counter_qu_int
+\end{beispiel}
+
+Now let's see a short example that hopefully explains what the macros do:
+\begin{beispiel}
+ % preamble
+ % \NewCounterPattern{testa}{ta}
+ \setcounter{testa}{11}
+ \ReadCounterPattern{ta}
+ \ReadCounterPattern{ta[a]} \\
+ \ttfamily\makeatletter
+ \meaning\@cntfmts@parsed@pattern
+ 
+ \bigskip
+ \SaveCounterPattern\tmpa\tmpb{ta[a]}
+ \meaning\tmpa \\
+ \meaning\tmpb
+ 
+ \bigskip
+ \eSaveCounterPattern\tmpa\tmpb{ta[a]}
+ \meaning\tmpa \\
+ \meaning\tmpb
+\end{beispiel}
+You can see that somehow additional (empty) groups and a \cmd*{relax} found their
+way into the interpreted and thus the expanded pattern. This is due to the fact
+that reading optional arguments expandably isn't easy and must have some safety
+net.
+
+\section{Predefined Patterns and Formats}\secidx[Predefined Patterns]{\cntformats}[cntformats]
+\cntformats predefines a number of pattern keys. These are listed in
+table~\ref{tab:predefined:patterns}.
+
+\begin{multicols}{2}
+\begin{center}
+ \centering
+ \captionof{table}{Predefined Patterns for the module \code{cntfmts}.}\label{tab:predefined:patterns}
+ \begin{tabular}{>{\ttfamily}l>{\ttfamily}l}
+  \toprule
+   \normalfont\bfseries counter & \normalfont\bfseries pattern \\
+  \midrule
+   chapter       & ch \\
+   section       & se \\
+   subsection    & sse \\
+   subsubsection & ssse \\
+   paragraph     & pg \\
+  \bottomrule
+ \end{tabular}
+
+ \captionof{table}{Predefined Formats}\label{tab:predefined:formats}
+ \begin{tabular}{>{\ttfamily}ll}
+  \toprule
+   \normalfont\bfseries key & \normalfont\bfseries format \\
+  \midrule
+   1 & \cmd{arabic} \\
+   a & \cmd{alph} \\
+   A & \cmd{Alph} \\
+   r & \cmd{roman} \\
+   R & \cmd{Roman} \\
+  \bottomrule
+ \end{tabular}
+\end{center}
+\end{multicols}
+
+Table~\ref{tab:predefined:formats} lists the predefined formats. If you want you
+can add own formats.
+\begin{beschreibung}
+ \Befehl{NewPatternFormat}{<pattern>}\ma{<format>}\newline
+   \code{<format>} is a number presentation command like \cmd{@alph}. This
+   command can only be used in the preamble.
+\end{beschreibung}
+
+\begin{beispiel}
+ % preamble
+ % \usepackage{alphalph}
+ % \makeatletter
+ % \NewPatternFormat{aa}{\alphalph@alph}
+ % \makeatother
+ \ReadCounterPattern{se[aa]}
+\end{beispiel}
+\secidx*{\cntformats}[cntformats]
+
+\appendix
+\part{Appendix}
+\addsec{A List of all Solutions used in this Manual}\label{sec:solutions:list}
+\SetupExSheets{headings=block,solutions-totoc}
+\printsolutions
+
+{\EmbracOff\RaggedRight\printbibliography}
+
+\setindexpreamble{Section titles are indicated \textbf{bold}, packages \textsf{sans
+serif}, commands \code{\textbackslash\textcolor{code}{brown}}, options \textcolor
+{key}{\code{yellow}} and modules \textcolor{module}{\code{blue}}.}
+\printindex
+\end{document}
\ No newline at end of file
diff --git a/Master/texmf-dist/tex/latex/exsheets/cntformats.sty b/Master/texmf-dist/tex/latex/exsheets/cntformats.sty
new file mode 100644
index 00000000000..41e4cef75d3
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/exsheets/cntformats.sty
@@ -0,0 +1,324 @@
+% --------------------------------------------------------------------------
+% the CNTFORMATS package
+% 
+%   A different way to read counters
+%
+% This package is part of the exsheets bundle
+% --------------------------------------------------------------------------
+% Clemens Niederberger
+% Web:    https://bitbucket.org/cgnieder/exsheets/
+% E-Mail: contact@mychemistry.eu
+% --------------------------------------------------------------------------
+% Copyright 2012 Clemens Niederberger
+% 
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+% 
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Clemens Niederberger.
+% --------------------------------------------------------------------------
+% The cntformats package consists of the files
+%  - cntformats.sty
+% --------------------------------------------------------------------------
+% If you have any ideas, questions, suggestions or bugs to report, please
+% feel free to contact me.
+% --------------------------------------------------------------------------
+\def\cntfmts@date{2012/10/08}
+\def\cntfmts@version{v0.2b}
+
+\ProvidesPackage{cntformats}[\cntfmts@date\space \cntfmts@version\space A different way to read counters.]
+\RequirePackage{etoolbox,xparse}
+% --------------------------------------------------------------------------
+% message handling
+\def\@cntfmts@error@message{%
+  For details have a look at the `exsheets' manual.}
+
+\def\@cntfmts@create@message#1{%
+  \ifstrequal{#1}{Error}
+    {%
+      \lowercase{\csdef{@cntfmts@#1}}##1{%
+        \csuse{Package#1}{cntformats}{##1}{\@cntfmts@error@message}}%
+    }{%
+      \lowercase{\csdef{@cntfmts@#1}}##1{%
+        \csuse{Package#1}{cntformats}{##1}}%
+    }}
+\@cntfmts@create@message{Error}
+\@cntfmts@create@message{Warning}
+\@cntfmts@create@message{WarningNoLine}
+\@cntfmts@create@message{Info}
+
+\def\@cntfmts@err@already@defined#1{%
+  \@cntfmts@error{The counter `#1' already exists!}}
+\def\@cntfmts@err@unknown@counter#1{%
+  \@cntfmts@error{The counter `#1' is undefined!}}
+\def\@cntfmts@err@pattern@defined#1#2{%
+  \@cntfmts@error{The pattern `#2' for module `#1' is already defined!}}
+\def\@cntfmts@err@pattern@undefined#1#2{%
+  \@cntfmts@error{The pattern `#2' for module `#1' is undefined!}}
+
+% ----------------------------------------------------------------------------
+% tokenlist analyzing and manipulating
+%   if you happen to read this code and notice some obvious reasons why these
+%   macros shoudn't be used like this, please send me your improved version
+%   (seriously! But please explain why yours is better)
+\def\ifintl#1#2{%
+  \def\@cntfmts@intl@tmpa##1#2{}%
+  \expandafter\if\expandafter\relax\expandafter
+  \detokenize\expandafter{\@cntfmts@intl@tmpa#1{}{}#2}\relax%
+    \expandafter\@secondoftwo
+  \else
+    \expandafter\@firstoftwo
+  \fi
+}
+\def\ifintlcs#1{%
+  \expandafter\ifintl\expandafter{#1}}
+
+\long\def\replaceonceincs#1#2#3{%
+  \ifintlcs#1{#2}%
+    {\@cntfmts@replace@once@incs#1{#2}{#3}}{}%
+}
+\long\def\@cntfmts@replace@once@incs#1#2#3{%
+  \def\@cntfmts@replo@tmpa##1#2##2\q@stop{%
+    \def#1{##1#3##2}}%
+  \expandafter\@cntfmts@replo@tmpa#1\q@stop
+}
+
+\long\def\replaceallin#1#2#3{%
+  \def\@cntfmts@repla@tmpa{#1}%
+  \replaceonceincs\@cntfmts@repla@tmpa{#2}{#3}%
+  \ifintlcs\@cntfmts@repla@tmpa{#2}%
+    {\expandafter\replaceallin\expandafter{\@cntfmts@repla@tmpa}{#2}{#3}}%
+    {\expandonce\@cntfmts@repla@tmpa}%
+}
+\long\def\replaceallincs#1#2#3{%
+  \replaceonceincs#1{#2}{#3}%
+  \ifintlcs#1{#2}{\replaceallincs#1{#2}{#3}}{}%
+}
+
+% ----------------------------------------------------------------------------
+% expansion tools
+%   heavily inspired by expl3's \exp_args:N<spec>
+\long\def\@cntfmts@getnextbraced#1#2#3{#2\@cntfmts@firstofone{#3{#1}}}
+\long\def\@cntfmts@firstofone#1{#1}
+\long\def\@cntfmts@braced@unexpanded#1\@cntfmts@firstofone#2#3{%
+  #1\@cntfmts@firstofone{#2{#3}}}
+\long\def\@cntfmts@braced@expandedonce#1\@cntfmts@firstofone#2#3{%
+  \expandafter\@cntfmts@getnextbraced\expandafter{#3}{#1}{#2}}
+
+\long\def\@cntfmts@expand@first{%
+  \@cntfmts@braced@expandedonce
+  \@cntfmts@firstofone}
+
+\long\def\@cntfmts@expand@second{%
+  \@cntfmts@braced@unexpanded
+  \@cntfmts@braced@expandedonce
+  \@cntfmts@firstofone}
+
+\long\def\@cntfmts@expand@third{%
+  \@cntfmts@braced@unexpanded
+  \@cntfmts@braced@unexpanded
+  \@cntfmts@braced@expandedonce
+  \@cntfmts@firstofone}
+
+% ----------------------------------------------------------------------------
+% expandable commands with optional argument (and no mandatory)
+%   this is probably not very robust. If you know what you're doing you're
+%   probably able to define a better version yourself. If not, don't use it
+\long\def\@cntfmts@isopt@#1[#2\q@marker#3#{%
+  \if\relax\detokenize{#1#2}\relax
+    \expandafter\@firstoftwo
+  \else
+    \expandafter\@secondoftwo
+  \fi}
+\long\def\@cntfmts@isopt#1#2#3{%
+  \@cntfmts@isopt@#1\q@marker[\q@marker{#2#1}{#2[{#3}]{#1}}}
+
+\long\def\@cntfmts@defwopt#1[#2]#3{%
+  \long\def#1##1{\@cntfmts@isopt{##1}{\csuse{\@cntfmts@strip@bs#1@opt}}{#2}}%
+  \long\csdef{\@cntfmts@strip@bs#1@opt}[##1]{#3}}
+
+\def\@cntfmts@strip@bs{\expandafter\@gobble\string}
+
+% ----------------------------------------------------------------------------
+% #1: module
+% #2: counter
+\def\@cntfmts@def@counter@read#1#2#3{%
+  \@cntfmts@expand@second\csdef
+    {@#1@read@#3@counter}%
+    {\csname @#1@read@#2@counter\endcsname}}
+
+% create pattern for an existing counter:
+% #1: module
+% #2: counter
+% #3: id
+\newcommand*\@cntfmts@add@counter@pattern[3][cntfmts]{%
+  \ifcsdef{the#2}
+    {}{\@cntfmts@err@unknown@counter{#2}}%
+  \ifcsdef{@#1@#2@counter}
+    {\@cntfmts@err@pattern@defined{#1}{#2}}
+    {\csdef{@#1@#2@counter}{}}%
+  \listcsadd{@#1@counter@ids}{#3}%
+  \@cntfmts@def@counter@read{#1}{#2}{#3}%
+}
+
+\newcommand*\@cntfmts@add@counter@pattern@nostar[3][cntfmts]{%
+  \@cntfmts@add@counter@pattern[#1]{#2}{#3}%
+  \@cntfmts@expand@third
+    \@cntfmts@create@read@counter{#1}{#2}{\csname c@#2\endcsname}}
+
+\newrobustcmd*\AddCounterPattern{%
+  \@ifstar
+    {\@cntfmts@add@counter@pattern}
+    {\@cntfmts@add@counter@pattern@nostar}}
+\@onlypreamble\AddCounterPattern
+
+% create pattern for a new counter
+% #1: counter
+% #2: id
+\newcommand*\@cntfmts@new@counter@pattern[3][cntfmts]{%
+  \ifcsdef{the#2}
+    {\@cntfmts@err@counter@defined{#2}}{}%
+  \newcounter{#2}%
+  \listcsadd{@#1@counter@ids}{#3}%
+  \@cntfmts@def@counter@read{#1}{#2}{#3}%
+  \csdef{@#1@#2@counter}{}
+}
+
+\newcommand*\@cntfmts@new@counter@pattern@nostar[3][cntfmts]{%
+  \@cntfmts@new@counter@pattern[#1]{#2}{#3}%
+  \@cntfmts@expand@third
+    \@cntfmts@create@read@counter{#1}{#2}{\csname c@#2\endcsname}}
+
+\newrobustcmd*\NewCounterPattern{%
+  \@ifstar
+    {\@cntfmts@new@counter@pattern}
+    {\@cntfmts@new@counter@pattern@nostar}}
+\@onlypreamble\NewCounterPattern
+
+% renew pattern:
+\newcommand*\@cntfmts@renew@counter@pattern[3][cntfmts]{%
+  \ifcsdef{the#2}
+    {}{\@cntfmts@err@unknown@counter{#2}}%
+  \ifcsdef{@#1@#2@counter}{}
+    {\@cntfmts@err@pattern@undefined{#1}{#2}}%
+  \ifinlistcs{@#1@counter@ids}{#3}
+    {}{\listcsadd{@#1@counter@ids}{#3}}%
+  \@cntfmts@def@counter@read{#1}{#2}{#3}%
+}
+
+\newcommand*\@cntfmts@renew@counter@pattern@nostar[3][cntfmts]{%
+  \@cntfmts@renew@counter@pattern[#1]{#2}{#3}%
+  \@cntfmts@expand@third
+    \@cntfmts@create@read@counter{#1}{#2}{\csname c@#2\endcsname}}
+
+\newrobustcmd\RenewCounterPattern{%
+  \@ifstar
+    {\@cntfmts@renew@counter@pattern}
+    {\@cntfmts@renew@counter@pattern@nostar}}
+\@onlypreamble\RenewCounterPattern
+
+% ----------------------------------------------------------------------------
+% assign a different internal command to <counter> than \c@<counter>
+% can/must be used after a call from \AddCounterPattern* or
+% \NewCounterPattern*
+% #1: module
+% #2: counter
+% #3: internal command
+\def\@cntfmts@create@read@counter#1#2#3{%
+  \expandafter\@cntfmts@defwopt\csname @#1@read@#2@counter\endcsname[]{%
+    \ifblank{##1}
+      {\@arabic{#3}}
+      {\csuse{@cntfmts@counter@type@##1}{#3}}%
+  }%
+}
+
+\newrobustcmd*\ReadCounterFrom[3][cntfmts]{%
+  \@cntfmts@create@read@counter{#1}{#2}{#3}}
+
+% ----------------------------------------------------------------------------
+% pattern formats
+% #1: key
+% #2: number presentation command like \@alph
+\def\@cntfmts@new@pattern@format#1#2{%
+  \csdef{@cntfmts@counter@type@#1}{#2}}
+
+\newrobustcmd*\NewPatternFormat[2]{%
+  \@cntfmts@new@pattern@format{#1}{#2}}
+\@onlypreamble\NewPatternFormat
+
+% ----------------------------------------------------------------------------
+% interpret and print pattern:
+% #1: module
+% #2: list
+% #3: pattern
+\def\@cntfmts@read@counter@pattern#1#2#3{%
+  \def\@cntfmts@parsed@pattern{#3\relax}%
+  \forlistcsloop{\@cntfmts@replace@pattern{#1}}{#2}%
+}
+% #1: module
+% #2: pattern-key
+\def\@cntfmts@replace@pattern#1#2{%
+  \replaceallincs\@cntfmts@parsed@pattern
+    {#2}{{}\csuse{@#1@read@#2@counter}}}
+
+\newrobustcmd*\ReadCounterPattern[2][cntfmts]{%
+  \@cntfmts@read@counter@pattern{#1}{@#1@counter@ids}{#2}\@cntfmts@parsed@pattern}
+
+\newrobustcmd*\ReadCounterPatternFrom[2][cntfmts]{%
+  \@cntfmts@expand@third\@cntfmts@read@counter@pattern{#1}{@#1@counter@ids}{#2}%
+  \@cntfmts@parsed@pattern}
+
+% #1: save pattern in
+% #2: save interpretation in
+% #3: pattern
+% #4: module
+\newcommand*\@cntfmts@save@counter@pattern[4]{%
+  \@cntfmts@read@counter@pattern{#4}{@#4@counter@ids}{#3}%
+  \let#2\@cntfmts@parsed@pattern
+  \def#1{#3}%
+}
+
+\newcommand*\@cntfmts@esave@counter@pattern[4]{%
+  \@cntfmts@read@counter@pattern{#4}{@#4@counter@ids}{#3}%
+  \edef#2{\@cntfmts@parsed@pattern}%
+  \def#1{#3}%
+}
+
+\newrobustcmd*\SaveCounterPattern[4][cntfmts]{%
+  \@cntfmts@save@counter@pattern{#2}{#3}{#4}{#1}}
+
+\newrobustcmd*\SaveCounterPatternFrom[4][cntfmts]{%
+  \@cntfmts@expand@third\@cntfmts@save@counter@pattern{#2}{#3}{#4}{#1}}
+
+\newrobustcmd*\eSaveCounterPattern[4][cntfmts]{%
+  \@cntfmts@esave@counter@pattern{#2}{#3}{#4}{#1}}
+
+\newrobustcmd*\eSaveCounterPatternFrom[4][cntfmts]{%
+  \@cntfmts@expand@third\@cntfmts@esave@counter@pattern{#2}{#3}{#4}{#1}}
+
+% ----------------------------------------------------------------------------
+% predefined formats and pattern
+\NewPatternFormat{a}{\@alph}
+\NewPatternFormat{A}{\@Alph}
+\NewPatternFormat{1}{\@arabic}
+\NewPatternFormat{r}{\@roman}
+\NewPatternFormat{R}{\@Roman}
+
+\ifdef\theparagraph
+  {\AddCounterPattern{paragraph}{pg}}{}
+\ifdef\thesubsubsection
+  {\AddCounterPattern{subsubsection}{ssse}}{}
+\ifdef\thesubsection
+  {\AddCounterPattern{subsection}{sse}}{}
+\ifdef\thesection
+  {\AddCounterPattern{section}{se}}{}
+\ifdef\thechapter
+  {\AddCounterPattern{chapter}{ch}}{}
+
+\endinput
\ No newline at end of file
diff --git a/Master/texmf-dist/tex/latex/exsheets/exsheets.sty b/Master/texmf-dist/tex/latex/exsheets/exsheets.sty
new file mode 100644
index 00000000000..db748f1baf5
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/exsheets/exsheets.sty
@@ -0,0 +1,2045 @@
+% ----------------------------------------------------------------------------
+% the EXSHEETS package
+% 
+%   Yet another package for the creation of exercise sheets
+% 
+% ----------------------------------------------------------------------------
+% Clemens Niederberger
+% Web:    https://bitbucket.org/cgnieder/exsheets/
+% E-Mail: contact@mychemistry.eu
+% ----------------------------------------------------------------------------
+% Copyright 2011-2012 Clemens Niederberger
+% 
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+% 
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Clemens Niederberger.
+% ----------------------------------------------------------------------------
+% The exsheets package consists of the files
+%  - exsheets.sty, exsheets_headings.def, exsheets_headings.cfg,
+%    exsheets_tasks.def, exsheets_tasks.cfg, exsheets_configurations.cfg,
+%  - exsheets_en.tex, exsheets_en.pdf,
+%  - README
+% ----------------------------------------------------------------------------
+% If you have any ideas, questions, suggestions or bugs to report, please
+% feel free to contact me.
+% ----------------------------------------------------------------------------
+\def\exsheets@date{2012/10/08}
+\def\exsheets@version{0.2b}
+
+\RequirePackage { expl3 , xparse }
+\ProvidesExplPackage
+  {exsheets}
+  {\exsheets@date}
+  {\exsheets@version}
+  {Yet another package for the creation of exercise sheets and exams.}
+
+% ----------------------------------------------------------------------------
+% temporary variables
+\tl_new:N    \l__exsheets_tmpa_tl
+\tl_new:N    \l__exsheets_tmpb_tl
+\tl_new:N    \l__exsheets_tmpc_tl
+\int_new:N   \l__exsheets_tmpa_int
+\int_new:N   \l__exsheets_tmpb_int
+\dim_new:N   \l__exsheets_tmpa_dim
+\seq_new:N   \l__exsheets_tmpa_seq
+\fp_new:N    \l__exsheets_tmpa_fp
+\clist_new:N \l__exsheets_tmpa_clist
+
+% ----------------------------------------------------------------------------
+% messages
+\msg_new:nnn { exsheets} { totalpoints }
+  {
+    You~need~to~activate~"points/parse"~if~you~want~to~use~
+    \token_to_str:N \totalpoints .~I~will~do~nothing~instead.
+  }
+
+\msg_new:nnn { exsheets} { headings }
+  {
+    You~requested~the~headings~instance~`#1'~which~is~not~defined.~Did~you~
+    forget~to~use~the~package~option~`load-headings'?~Anyway,~I~will~use~the~
+    instance~`block'~instead~and~pretend~nothing~happened.
+  }
+
+\msg_new:nnn { exsheets } { random }
+  {
+    You~asked~me~to~select~#1~questions~from~file~#2~but~there~are~only~#3.~
+    I'll~select~all~of~them.
+  }
+
+\msg_new:nnn { exsheets } { only-inside-question }
+  {
+    The~command~\token_to_str:N #1 \c_space_tl can~only~be~used~inside~
+    the~question~environment.
+  }
+
+\msg_new:nnn { exsheets } { loading-configurations }
+  { Loading~custom~configurations~file~`exsheets_configurations.cgf'. }
+
+\msg_new:nnn { exsheets } { deprecated-command }
+  {
+    The~command~"~\token_to_str:N #1 \c_space_tl"~is~deprecated.~
+    Use~"~\token_to_str:N #2 \c_space_tl"~instead.
+  }
+
+\msg_new:nnn { exsheets } { grade-missing }
+  { The~grade~`#1'~has~never~been~declared. }
+
+\msg_new:nnn { exsheets } { grade-parse }
+  {
+    I~cannot~calculate~the~points~for~grade~`#1'~since~you're~using~the~option~
+    `points/parse=false'.
+  }
+
+\cs_new:Npn \exsheets_depr_cmd:nn #1#2
+  {
+    \cs_new:Npn #1
+      { \msg_warning:nnnn { exsheets } { deprecated-command } { #1 } { #2 } #2 }
+  }
+
+% ----------------------------------------------------------------------------
+\RequirePackage
+  { xtemplate , l3sort , l3keys2e , xcolor , etoolbox , environ , lcg , silence }
+
+% ----------------------------------------------------------------------------
+% color:
+\xdefinecolor { exsheetsblue } { rgb } { 0.02 , 0.04 , 0.48 }
+\xdefinecolor { exsheetsred  } { rgb } { 0.65 , 0.04 , 0.07 }
+\tl_new:N   \g__exsheets_color_tl
+\tl_gset:Nn \g__exsheets_color_tl { exsheetsblue }
+
+% ----------------------------------------------------------------------------
+% how are questions/solutions/... counted?
+\bool_new:N      \l__exsheets_print_number_bool
+\bool_set_true:N \l__exsheets_print_number_bool
+
+\tl_new:N  \l__exsheets_qu_counter_pattern_tl
+\tl_set:Nn \l__exsheets_qu_counter_pattern_tl { qu. }
+\tl_new:N  \l__exsheets_qu_counter_interpretation_tl
+\tl_new:N  \l__exsheets_counter_patterns_tl
+\tl_new:N  \l__exsheets_current_pattern_interpretation_tl
+\tl_new:N  \l__exsheets_current_pattern_tl
+
+\RequirePackage { cntformats }
+
+\cs_if_exist:NT \thechapter
+  {
+    \AddCounterPattern* [ exsheets ] { chapter } { ch }
+    \ReadCounterFrom [ exsheets ] { chapter } \l__exsheets_counter_ch_int
+  }
+
+\AddCounterPattern* [ exsheets ] { section } { se }
+\ReadCounterFrom [ exsheets ] { section } \l__exsheets_counter_sec_int
+
+\NewCounterPattern* [ exsheets ] { question } { qu }
+\ReadCounterFrom [ exsheets ] { question } \l__exsheets_counter_qu_int
+
+% ----------------------------------------------------------------------------
+% (also) package options:
+\bool_new:N \l__exsheets_load_headings_bool
+\bool_new:N \l__exsheets_load_tasks_bool
+\bool_new:N \l__exsheets_solutions_by_ref_bool
+\bool_new:N \l__exsheets_questions_totoc_bool
+\bool_new:N \l__exsheets_solutions_totoc_bool
+
+\tl_new:N   \l__exsheets_heading_instance_tl
+\tl_set:Nn  \l__exsheets_heading_instance_tl { block }
+\tl_new:N   \l__exsheets_heading_title_user_format_tl
+\tl_set:Nn  \l__exsheets_heading_title_user_format_tl { \normalsize\bfseries }
+\tl_new:N   \l__exsheets_questions_toclevel_tl
+\tl_set:Nn  \l__exsheets_questions_toclevel_tl { subsection }
+\tl_new:N   \l__exsheets_solutions_toclevel_tl
+\tl_set:Nn  \l__exsheets_solutions_toclevel_tl { subsection }
+
+\AtBeginDocument{
+  \cs_if_exist:NF \phantomsection
+    { \cs_new:Npn \phantomsection {} }
+}
+
+\keys_define:nn { exsheets }
+  {
+    color                     .tl_gset:N  = \g__exsheets_color_tl ,
+    counter-format            .code:n     =
+      \SaveCounterPattern [ exsheets ]
+        \l__exsheets_qu_counter_pattern_tl
+        \l__exsheets_qu_counter_interpretation_tl
+        { #1 } ,
+    counter-within            .code:n     = \@addtoreset{question}{#1} ,
+    headings                  .tl_set:N   = \l__exsheets_heading_instance_tl ,
+    load-headings             .bool_set:N = \l__exsheets_load_headings_bool ,
+    headings-format           .tl_set:N   = \l__exsheets_heading_title_user_format_tl ,
+    load-tasks                .bool_set:N = \l__exsheets_load_tasks_bool ,
+    use-ref                   .bool_set:N = \l__exsheets_solutions_by_ref_bool ,
+    totoc                     .choice: ,
+    totoc / true              .code:n     =
+      \bool_set_true:N \l__exsheets_questions_totoc_bool
+      \bool_set_true:N \l__exsheets_solutions_totoc_bool ,
+    totoc / false             .code:n     =
+      \bool_set_false:N \l__exsheets_questions_totoc_bool
+      \bool_set_false:N \l__exsheets_solutions_totoc_bool ,
+    totoc                     .default:n  = true ,
+    questions-totoc           .bool_set:N = \l__exsheets_questions_totoc_bool ,
+    solutions-totoc           .bool_set:N = \l__exsheets_solutions_totoc_bool ,
+    toc-level                 .code:n     =
+      \tl_set:Nn \l__exsheets_questions_toclevel_tl { #1 }
+      \tl_set:Nn \l__exsheets_solutions_toclevel_tl { #1 } ,
+    questions-toc-level       .tl_set:N   = \l__exsheets_questions_toclevel_tl ,
+    solutions-toc-level       .tl_set:N   = \l__exsheets_solutions_toclevel_tl
+  }
+\keys_set:nn { exsheets} { counter-format = qu. }
+
+% process package options:
+\ProcessKeysOptions { exsheets }
+
+% ----------------------------------------------------------------------------
+% points for exercises
+\bool_new:N       \l__exsheets_points_questions_default_bool
+\bool_set_false:N \l__exsheets_points_questions_default_bool
+\bool_new:N       \l__exsheets_parse_points_bool
+\bool_set_true:N  \l__exsheets_parse_points_bool
+\bool_new:N       \l__exsheets_points_name_bool
+\bool_set_true:N  \l__exsheets_points_name_bool
+\bool_new:N       \l__exsheets_points_separate_bonus_bool
+
+\fp_new:N         \g__exsheets_points_sum_fp
+\fp_new:N         \l__exsheets_points_default_fp
+\fp_set:Nn        \l__exsheets_points_default_fp { 1 }
+\fp_new:N         \l__exsheets_question_points_fp
+\fp_new:N         \g__exsheets_total_points_fp
+\fp_new:N         \g__exsheets_bonus_sum_fp
+\fp_new:N         \l__exsheets_question_bonus_fp
+\fp_new:N         \g__exsheets_total_bonus_fp
+
+\tl_new:N         \l__exsheets_points_name_tl
+\tl_set:Nn        \l__exsheets_points_name_tl { P. }
+\tl_new:N         \l__exsheets_points_name_plural_tl
+\tl_set:Nn        \l__exsheets_points_name_plural_tl { P. }
+\tl_new:N         \l__exsheets_bonus_name_tl
+\tl_set:Nn        \l__exsheets_bonus_name_tl { P. }
+\tl_new:N         \l__exsheets_bonus_name_plural_tl
+\tl_set:Nn        \l__exsheets_bonus_name_plural_tl { P. }
+\tl_new:N         \l__exsheets_points_number_format_tl
+\tl_new:N         \l__exsheets_bonus_number_format_tl
+\tl_new:N         \l__exsheets_points_pre_bonus_marker_tl
+\tl_set:Nn        \l__exsheets_points_pre_bonus_marker_tl { (+ }
+\tl_new:N         \l__exsheets_points_post_bonus_marker_tl
+\tl_set:Nn        \l__exsheets_points_post_bonus_marker_tl { ) }
+
+\cs_new_nopar:Npn \exsheets_set_points_name:n #1
+  {
+    \tl_if_in:nnTF { #1 } { / }
+      { \__exsheets_set_points_name_aux:nn #1 \q_stop }
+      { \__exsheets_set_points_name_aux:nn #1 / \q_stop }
+  }
+
+\cs_new_nopar:Npn \__exsheets_set_points_name_aux:nn #1/#2 \q_stop
+  {
+    \tl_set:Nn \l__exsheets_points_name_tl { #1 }
+    \tl_set:Nn \l__exsheets_points_name_plural_tl { #1#2 }
+  }
+
+\cs_new_nopar:Npn \exsheets_set_bonus_name:n #1
+  {
+    \tl_if_in:nnTF { #1 } { / }
+      { \__exsheets_set_bonus_name_aux:nn #1 \q_stop }
+      { \__exsheets_set_bonus_name_aux:nn #1 / \q_stop }
+  }
+
+\cs_new_nopar:Npn \__exsheets_set_bonus_name_aux:nn #1/#2 \q_stop
+  {
+    \tl_set:Nn \l__exsheets_bonus_name_tl { #1 }
+    \tl_set:Nn \l__exsheets_bonus_name_plural_tl { #1#2 }
+  }
+
+% FIXME: \fp_add will deprecate!
+\cs_new_nopar:Npn \exsheets_add_points:n #1
+  { \fp_gadd:Nn \g__exsheets_points_sum_fp { #1 } }
+\cs_generate_variant:Nn \exsheets_add_points:n { V }
+
+\cs_new_nopar:Npn \exsheets_add_bonus:n #1
+  { \fp_gadd:Nn \g__exsheets_bonus_sum_fp { #1 } }
+\cs_generate_variant:Nn \exsheets_add_bonus:n { V }
+
+\cs_new_nopar:Npn \exsheets@sum@of@points #1
+  { \fp_gset:Nn \g__exsheets_total_points_fp { #1 } }
+
+\cs_new_nopar:Npn \exsheets@sum@of@bonus #1
+  { \fp_gset:Nn \g__exsheets_total_bonus_fp { #1 } }
+
+\cs_new_nopar:Npn \exsheets_parse_points:n #1
+  {
+    \group_begin:
+      \tl_use:N \l__exsheets_points_number_format_tl
+        {
+          \bool_if:NTF \l__exsheets_parse_points_bool
+            { \exsheets_num:n { \fp_to_decimal:n { #1 } } }
+            { \use:n { \fp_to_decimal:n { #1 } } }
+        }
+    \group_end:
+  }
+\cs_generate_variant:Nn \exsheets_parse_points:n { V }
+
+\cs_new_nopar:Npn \exsheets_parse_bonus:n #1
+  {
+    \group_begin:
+      \tl_use:N \l__exsheets_bonus_number_format_tl
+        {
+          \bool_if:NTF \l__exsheets_parse_points_bool
+            { \exsheets_num:n { \fp_to_decimal:n { #1 } } }
+            { \use:n { \fp_to_decimal:n { #1 } } }
+        }
+    \group_end:
+  }
+\cs_generate_variant:Nn \exsheets_parse_bonus:n { V }
+
+\cs_new_nopar:Npn \exsheets_num:n #1
+  {
+    \group_begin:
+      \fp_set:Nn \l__exsheets_tmpa_tl { #1 }
+      \fp_to_tl:N \l__exsheets_tmpa_tl
+    \group_end:
+  }
+\cs_generate_variant:Nn \exsheets_num:n { x }
+
+\cs_new_nopar:Npn \exsheets_points_name:n #1
+  {
+    \bool_if:NT \l__exsheets_points_name_bool
+      {
+        \,
+        \hbox:n
+          {
+            \bool_if:NTF \l__exsheets_parse_points_bool
+              {
+                \tl_if_eq:nnTF { #1 } { ?? }
+                  { \tl_use:N \l__exsheets_points_name_plural_tl }
+                  {
+                    \fp_compare:nTF { #1 <=  1 }
+                      { \tl_use:N \l__exsheets_points_name_tl }
+                      { \tl_use:N \l__exsheets_points_name_plural_tl }
+                  }
+              }
+              { \tl_use:N \l__exsheets_points_name_plural_tl }
+          }
+      }
+  }
+\cs_generate_variant:Nn \exsheets_points_name:n { V }
+
+\cs_new_nopar:Npn \exsheets_bonus_name:n #1
+  {
+    \bool_if:NT \l__exsheets_points_name_bool
+      {
+        \,
+        \hbox:n
+          {
+            \bool_if:NTF \l__exsheets_parse_points_bool
+              {
+                \tl_if_eq:nnTF { #1 } { ?? }
+                  { \tl_use:N \l__exsheets_bonus_name_plural_tl }
+                  {
+                    \fp_compare:nTF { #1 <=  1 }
+                      { \tl_use:N \l__exsheets_bonus_name_tl }
+                      { \tl_use:N \l__exsheets_bonus_name_plural_tl }
+                  }
+              }
+              { \tl_use:N \l__exsheets_bonus_name_plural_tl }
+          }
+      }
+  }
+\cs_generate_variant:Nn \exsheets_bonus_name:n { V }
+
+\NewDocumentCommand \addpoints { sm }
+  {
+    \bool_if:NTF \l__exsheets_inside_question_bool
+      {
+        \exsheets_add_points:n { #2 }
+        \IfBooleanF { #1 } { \exsheets_print_points:n { #2 } }
+      }
+      { \msg_error:nnn { exsheets } { only-inside-question } { \addpoints } }
+  }
+
+\NewDocumentCommand \addbonus { sm }
+  {
+    \bool_if:NTF \l__exsheets_inside_question_bool
+      {
+        \exsheets_add_bonus:n { #2 }
+        \IfBooleanF { #1 } { \exsheets_print_bonus:n { #2 } }
+      }
+      { \msg_error:nnn { exsheets } { only-inside-question } { \addbonus } }
+  }
+
+\NewDocumentCommand \points { sm }
+  {
+    \IfBooleanTF { #1 }
+      { \exsheets_parse_points:n { #2 } }
+      { \exsheets_print_points:n { #2 } }
+  }
+
+\NewDocumentCommand \bonus { sm }
+  {
+    \IfBooleanTF { #1 }
+      { \exsheets_parse_bonus:n { #2 } }
+      { \exsheets_print_bonus:n { #2 } }
+  }
+
+\cs_new_nopar:Npn \exsheets_print_points:n #1
+  {
+    \exsheets_parse_points:n { #1 }
+    \exsheets_points_name:n { #1 }
+  }
+\cs_generate_variant:Nn \exsheets_print_points:n { V }
+
+\cs_new_nopar:Npn \exsheets_print_bonus:n #1
+  {
+    \exsheets_parse_bonus:n { #1 }
+    \exsheets_bonus_name:n { #1 }
+  }
+\cs_generate_variant:Nn \exsheets_print_bonus:n { V }
+
+\NewDocumentCommand \pointssum { s }
+  {
+    \IfBooleanTF { #1 }
+      { \exsheets_parse_points:n { \g__exsheets_total_points_fp } }
+      { \exsheets_print_points:n { \g__exsheets_total_points_fp } }
+  }
+
+\NewDocumentCommand \bonussum { s }
+  {
+    \IfBooleanTF { #1 }
+      { \exsheets_parse_bonus:n { \g__exsheets_total_bonus_fp } }
+      { \exsheets_print_bonus:n { \g__exsheets_total_bonus_fp } }
+  }
+
+\NewDocumentCommand \currentpointssum { s }
+  {
+    \IfBooleanTF { #1 }
+      { \exsheets_parse_points:n { \g__exsheets_points_sum_fp } }
+      { \exsheets_print_points:n { \g__exsheets_points_sum_fp } }
+  }
+
+\NewDocumentCommand \currentbonussum { s }
+  {
+    \IfBooleanTF { #1 }
+      { \exsheets_parse_bonus:n { \g__exsheets_bonus_sum_fp } }
+      { \exsheets_print_bonus:n { \g__exsheets_bonus_sum_fp } }
+  }
+
+\NewDocumentCommand \totalpoints { s }
+  {
+    \exsheets_totalpoints:
+    \IfBooleanF { #1 }
+      {
+        \bool_if:nT
+          {
+            \l__exsheets_points_separate_bonus_bool ||
+            \fp_compare_p:n { \g__exsheets_total_bonus_fp = 0 }
+          }
+          { \exsheets_points_name:n { \g__exsheets_total_points_fp } }
+      }
+    \exsheets_totalbonus:
+    \IfBooleanF { #1 }
+      {
+        \fp_compare:nF { \g__exsheets_total_bonus_fp = 0 }
+          {
+            \bool_if:NTF \l__exsheets_points_separate_bonus_bool
+              { \exsheets_bonus_name:n { \g__exsheets_total_bonus_fp } }
+              {
+                \exsheets_points_name:n
+                  { \g__exsheets_total_points_fp + \g__exsheets_total_bonus_fp }
+              }
+          }
+      }
+  }
+
+\exsheets_depr_cmd:nn { \sumpoints } { \totalpoints* }
+
+\cs_new_nopar:Npn \exsheets_totalpoints:
+  {
+    \bool_if:NTF \l__exsheets_parse_points_bool
+      {
+        \fp_compare:nTF { \g__exsheets_total_points_fp = 0 }
+          { ?? \, \exsheets_points_name:n { ?? } }
+          {
+            \exsheets_parse_points:n
+              { \g__exsheets_total_points_fp }
+          }
+      }
+      { \msg_warning:nn { exsheets } { totalpoints } }
+  }
+
+\cs_new_nopar:Npn \exsheets_totalbonus:
+  {
+    \bool_if:NT \l__exsheets_parse_points_bool
+      {
+        \fp_compare:nF { \g__exsheets_total_bonus_fp = 0 }
+          {
+            \tl_use:N \c_space_tl
+            \tl_use:N \l__exsheets_points_pre_bonus_marker_tl
+            \exsheets_parse_bonus:n
+              { \g__exsheets_total_bonus_fp }
+            \tl_use:N \l__exsheets_points_post_bonus_marker_tl
+          }
+      }
+  }
+
+\keys_define:nn { exsheets / points }
+  {
+    name                 .code:n     =
+      \exsheets_set_points_name:n { #1 }
+      \exsheets_set_bonus_name:n { #1 } ,
+    name-plural          .code:n     =
+      \tl_set:Nn \l__exsheets_points_name_plural_tl { #1 }
+      \tl_set:Nn \l__exsheets_bonus_name_plural_tl { #1 } ,
+    bonus-name           .code:n     = \exsheets_set_bonus_name:n { #1 } ,
+    bonus-plural         .tl_set:N   = \l__exsheets_bonus_name_plural_tl ,
+    pre-bonus            .tl_set:N   = \l__exsheets_points_pre_bonus_marker_tl ,
+    post-bonus           .tl_set:N   = \l__exsheets_points_post_bonus_marker_tl ,
+    use-name             .bool_set:N = \l__exsheets_points_name_bool ,
+    number-format        .tl_set:N   = \l__exsheets_points_number_format_tl ,
+    bonus-format         .tl_set:N   = \l__exsheets_bonus_number_format_tl ,
+    parse                .bool_set:N = \l__exsheets_parse_points_bool ,
+    separate-bonus       .bool_set:N = \l__exsheets_points_separate_bonus_bool
+  }
+
+% ----------------------------------------------------------------------------
+% Noten-Verteilung
+\prop_new:N \l__exsheets_relgrades_prop
+\fp_new:N   \l__exsheets_grade_round_fp
+\fp_zero:N  \l__exsheets_grade_round_fp
+\bool_new:N \l__exsheets_grades_half_bool
+
+\cs_new:Npn \__exsheets_fp_round_to_half:n #1
+  { round( 2*(#1),0)/2 }
+
+\cs_new:Npn \__exsheets_grades_round:n #1
+  { round ( #1 , \l__exsheets_grade_round_fp ) }
+
+\cs_new:Npn \__exsheets_grade_rounded:
+  {
+    \bool_if:NTF { \l__exsheets_grades_half_bool }
+      { \__exsheets_fp_round_to_half:n }
+      { \__exsheets_grades_round:n }
+    { \g__exsheets_total_points_fp * \l__exsheets_tmpa_fp }
+  }
+
+\cs_new:Npn \exsheets_strip_braces:N #1
+  { \exp_after:wN \__exsheets_strip_braces:w \exp_after:wN #1#1 \q_stop }
+\cs_new:Npn \__exsheets_strip_braces:w #1#2 \q_stop
+  { \tl_set:Nn #1 { #2 } }
+
+\cs_new:Npn \__exsheets_declare_relgrades:n #1
+  {
+    \clist_set:Nn \l__exsheets_tmpa_clist { #1 }
+    \clist_map_inline:Nn \l__exsheets_tmpa_clist
+      { \__exsheets_declare_relgrade:w ##1 \q_stop }
+  }
+
+\cs_new:Npn \__exsheets_declare_relgrade:w #1 = #2 \q_stop
+  {
+    \tl_set:Nn \l__exsheets_tmpa_tl { #1 }
+    \tl_set:Nn \l__exsheets_tmpb_tl { #2 }
+    \tl_trim_spaces:N \l__exsheets_tmpa_tl
+    \exsheets_strip_braces:N \l__exsheets_tmpa_tl
+    \tl_trim_spaces:N \l__exsheets_tmpb_tl
+    \exsheets_strip_braces:N \l__exsheets_tmpb_tl
+    \prop_put:NVV \l__exsheets_relgrades_prop
+      \l__exsheets_tmpa_tl
+      \l__exsheets_tmpb_tl
+  }
+
+\NewDocumentCommand \DeclareRelGrades { m }
+  { \__exsheets_declare_relgrades:n { #1 } }
+\@onlypreamble\DeclareRelGrades
+
+\cs_new:Npn \__exsheets_grade:nn #1#2
+  {
+    \prop_get:NnNTF \l__exsheets_relgrades_prop { #2 } \l__exsheets_tmpa_fp
+      {
+        \bool_if:NTF \l__exsheets_parse_points_bool
+          {
+            \exsheets_parse_points:n
+              { min( \__exsheets_grade_rounded: , \g__exsheets_total_points_fp ) }
+            \int_compare:nT { #1 = 1 }
+              {
+                \exsheets_points_name:n
+                  { min( \__exsheets_grade_rounded: , \g__exsheets_total_points_fp ) }
+              }
+          }
+          { \msg_warning:nnn { exsheets } { grade-parse } { #1 } \textbf{??} }
+      }
+      { \msg_warning:nnn { exsheets } { grade-missing } { #1 } \textbf{??} }
+  }
+
+\NewDocumentCommand \grade { sm }
+  {
+    \IfBooleanTF { #1 }
+      { \__exsheets_grade:nn { 0 } { #2 } }
+      { \__exsheets_grade:nn { 1 } { #2 } }
+  }
+
+\keys_define:nn { exsheets / grades }
+  {
+    round .fp_set:N   = \l__exsheets_grade_round_fp ,
+    half  .bool_set:N = \l__exsheets_grades_half_bool
+  }
+
+% ----------------------------------------------------------------------------
+% Aufgaben und Lösungen
+
+% Einteilung in Klassen und Themen
+\prop_new:N        \g__exsheets_questions_class_prop
+\prop_new:N        \g__exsheets_classes_prop
+\prop_new:N        \g__exsheets_classes_active_prop
+\prop_new:N        \g__exsheets_questions_topic_prop
+\prop_new:N        \g__exsheets_topics_prop
+\prop_new:N        \g__exsheets_topics_active_prop
+
+\bool_new:N        \g__exsheets_questions_use_bool
+\bool_gset_true:N  \g__exsheets_questions_use_bool
+\bool_new:N        \l__exsheets_questions_use_bool
+\bool_set_true:N   \l__exsheets_questions_use_bool
+\bool_new:N        \l__exsheets_questions_deactivate_bool
+\bool_new:N        \l__exsheets_questions_class_bool
+\bool_set_false:N  \l__exsheets_questions_class_bool
+\bool_new:N        \g__exsheets_use_classes_bool
+\bool_gset_false:N \g__exsheets_use_classes_bool
+\bool_new:N        \l__exsheets_class_active_bool
+\bool_new:N        \l__exsheets_questions_topic_bool
+\bool_set_false:N  \l__exsheets_questions_topic_bool
+\bool_new:N        \g__exsheets_use_topics_bool
+\bool_gset_false:N \g__exsheets_use_topics_bool
+\bool_new:N        \l__exsheets_topic_active_bool
+\bool_new:N        \l__exsheets_solutions_use_bool
+\bool_set_true:N   \l__exsheets_solutions_use_bool
+
+\tl_new:N          \l__exsheets_questions_class_tl
+\tl_new:N          \l__exsheets_questions_topic_tl
+
+\dim_new:N         \l__exsheets_questions_skip_below_dim
+\dim_set:Nn        \l__exsheets_questions_skip_below_dim { .5\baselineskip }
+\dim_new:N         \l__exsheets_solutions_skip_below_dim
+\dim_set:Nn        \l__exsheets_solutions_skip_below_dim { .5\baselineskip }
+
+\cs_new_nopar:Npn \exsheets_glue:N #1
+  { \cleaders \vbox:n {} \skip_vertical:N #1 }
+
+\keys_define:nn { exsheets }
+  {
+    use-classes .code:n =
+      {
+        \bool_gset_true:N \g__exsheets_use_classes_bool
+        \__exsheets_activate_classes:n { #1 }
+      } ,
+    use-topics .code:n =
+      {
+        \bool_gset_true:N \g__exsheets_use_topics_bool
+        \__exsheets_activate_topics:n { #1 }
+      } ,
+    skip-below .code:n =
+      \dim_set:Nn \l__exsheets_questions_skip_below_dim { #1 }
+      \dim_set:Nn \l__exsheets_solutions_skip_below_dim { #1 }
+  }
+
+\cs_new:Npn \__exsheets_activate_classes:n #1
+  {
+    \prop_gclear:N \g__exsheets_classes_active_prop
+    \seq_set_split:Nnn \l__exsheets_tmpa_seq { , } { #1 }
+    \seq_map_inline:Nn \l__exsheets_tmpa_seq
+      {
+        \prop_gput:Nnn \g__exsheets_classes_active_prop
+          { ##1 } { \__exsheets_dummy: }
+      }
+  }
+
+\cs_new:Npn \__exsheets_activate_topics:n #1
+  {
+    \prop_gclear:N \g__exsheets_topics_active_prop
+    \seq_set_split:Nnn \l__exsheets_tmpa_seq { , } { #1 }
+    \seq_map_inline:Nn \l__exsheets_tmpa_seq
+      {
+        \prop_gput:Nnn \g__exsheets_topics_active_prop
+          { ##1 } { \__exsheets_dummy: }
+      }
+  }
+
+\cs_new_nopar:Npn \__exsheets_questions_use_classes:
+  {
+    % is there a class provided?
+    \bool_if:NT \l__exsheets_questions_class_bool
+      {
+        % add class to questions property
+        \prop_gput:Nff \g__exsheets_questions_class_prop
+          { \int_to_arabic:n { \g__exsheets_questions_id_int } }
+          { \l__exsheets_questions_class_tl }
+        % add to classes list, if it's a new one
+        \prop_get:NoN \g__exsheets_classes_prop
+          { \l__exsheets_questions_class_tl }
+          \l__exsheets_tmpa_tl
+        \tl_if_eq:NNT \l__exsheets_tmpa_tl \q_no_value
+          {
+            \prop_gput:Nfn \g__exsheets_classes_prop
+              { \l__exsheets_questions_class_tl }
+              { \__exsheets_dummy: }
+          }
+      }
+    % are we using classes?
+    \bool_if:NT \g__exsheets_use_classes_bool
+      {
+        % is this question an active one?
+        \prop_get:NoN \g__exsheets_classes_active_prop
+          { \l__exsheets_questions_class_tl }
+          \l__exsheets_tmpa_tl
+        \tl_if_eq:NNTF \l__exsheets_tmpa_tl \q_no_value
+          {
+            \bool_set_false:N \l__exsheets_class_active_bool
+            \bool_set_false:N \l__exsheets_questions_print_bool
+          }
+          { \bool_set_true:N \l__exsheets_class_active_bool }
+      }
+  }
+
+\cs_new_nopar:Npn \__exsheets_questions_use_topics:
+  {
+    % is there a topic provided?
+    \bool_if:NT \l__exsheets_questions_topic_bool
+      {
+        % add topic to questions property
+        \prop_gput:Nff \g__exsheets_questions_topic_prop
+          { \int_to_arabic:n { \g__exsheets_questions_id_int } }
+          { \l__exsheets_questions_topic_tl }
+        % add to topics list, if it's a new one
+        \prop_get:NoN \g__exsheets_topics_prop
+          { \l__exsheets_questions_topic_tl }
+          \l__exsheets_tmpa_tl
+        \tl_if_eq:NNT \l__exsheets_tmpa_tl \q_no_value
+          {
+            \prop_gput:Nfn \g__exsheets_topics_prop
+              { \l__exsheets_questions_topic_tl }
+              { \__exsheets_dummy: }
+          }
+      }
+    % are we using topics?
+    \bool_if:NT \g__exsheets_use_topics_bool
+      {
+        % is this question an active one?
+        \prop_get:NoN \g__exsheets_topics_active_prop
+          { \l__exsheets_questions_topic_tl }
+          \l__exsheets_tmpa_tl
+        \tl_if_eq:NNTF \l__exsheets_tmpa_tl \q_no_value
+          {
+            \bool_set_false:N \l__exsheets_topic_active_bool
+            \bool_set_false:N \l__exsheets_questions_print_bool
+          }
+          { \bool_set_true:N \l__exsheets_topic_active_bool }
+      }
+    \int_set:Nn \l__exsheets_counter_qu_int { \arabic{question} }
+  }
+
+\cs_new_nopar:Npn \__exsheets_solutions_use_classes:
+  {
+    % are we using classes?
+    \bool_if:NT \g__exsheets_use_classes_bool
+      {
+        % is the question to this solution an active one?
+        % get question number from ID
+        \prop_get:NoN \g__exsheets_questions_id_prop
+          { \g__exsheets_questions_current_id_tl } \l__exsheets_tmpa_tl
+        % get question class from number
+        \prop_get:NoN \g__exsheets_questions_class_prop
+          { \l__exsheets_tmpa_tl } \l__exsheets_tmpb_tl
+        % test if class is active
+        \prop_get:NoN \g__exsheets_classes_active_prop
+          { \l__exsheets_tmpb_tl } \l__exsheets_tmpc_tl
+        \tl_if_eq:NNTF \l__exsheets_tmpc_tl \q_no_value
+          { \bool_set_false:N \l__exsheets_solutions_use_bool }
+          { \bool_set_true:N \l__exsheets_solutions_use_bool }
+      }
+  }
+
+\cs_new_nopar:Npn \__exsheets_solutions_use_topics:
+  {
+    % are we using topics?
+    \bool_if:NTF \g__exsheets_use_topics_bool
+      {
+        % is the question to this solution an active one?
+        % get question number from ID
+        \prop_get:NoN \g__exsheets_questions_id_prop
+          { \g__exsheets_questions_current_id_tl } \l__exsheets_tmpa_tl
+        % get question topic from number
+        \prop_get:NoN \g__exsheets_questions_topic_prop
+          { \l__exsheets_tmpa_tl } \l__exsheets_tmpb_tl
+        % test if topic is active
+        \prop_get:NoN \g__exsheets_topics_active_prop
+          { \l__exsheets_tmpb_tl } \l__exsheets_tmpc_tl
+        \tl_if_eq:NNT \l__exsheets_tmpc_tl \q_no_value
+          { \bool_set_false:N \l__exsheets_solutions_use_bool }
+      }
+      {
+        \bool_if:NF \g__exsheets_use_classes_bool
+          { \bool_set_true:N \l__exsheets_solutions_use_bool }
+      }
+  }
+
+% ----------------------------------------------------------------------------
+% die 'question' Umgebung
+\tl_new:N         \l__exsheets_questions_name_tl
+\tl_set:Nn        \l__exsheets_questions_name_tl { Question }
+\tl_new:N         \l__exsheets_exsheets_name_tl
+\tl_set:Nn        \l__exsheets_exsheets_name_tl { Exercise }
+
+\bool_new:N       \l__exsheets_questions_print_bool
+\bool_set_true:N  \l__exsheets_questions_print_bool
+\bool_new:N       \l__exsheets_inside_question_bool
+
+\int_new:N        \g__exsheets_questions_id_int
+\int_gzero:N      \g__exsheets_questions_id_int
+
+\NewEnviron { __exsheets_questions_internal: }
+  {
+    \cspreto { BODY } { \ifhmode \vspace*{0pt} \fi }
+    \csappto { BODY }
+      {
+        \par
+        \dim_compare:nNnT { \parskip } = { 0pt }
+          { \exsheets_glue:N \l__exsheets_questions_skip_below_dim }
+      }
+    \bool_if:nT
+      {
+        \l__exsheets_questions_print_bool &&
+        \g__exsheets_questions_use_bool &&
+        !\l__exsheets_questions_deactivate_bool
+      }
+      {
+        \__exsheets_save_number_in:N \g__exsheets_question_number_prop
+        \BODY
+      }
+  }
+
+\prop_new:N \g__exsheets_questions_id_prop
+
+\tl_new:N   \l__exsheets_questions_id_tl
+\tl_new:N   \g__exsheets_questions_current_id_tl
+\tl_new:N   \l__exsheets_title_tl
+
+\bool_new:N \l__exsheets_points_not_given_bool
+
+\cs_new:Npn \__exsheets_read_points:w #1+#2+#3 \q_stop
+  {
+    \tl_if_blank:nTF { #1 }
+      { \fp_zero:N \l__exsheets_question_points_fp }
+      { \fp_set:Nn \l__exsheets_question_points_fp { #1 } }
+    \tl_if_blank:nTF { #2 }
+      { \fp_zero:N \l__exsheets_question_bonus_fp }
+      {
+        \tl_if_blank:nTF { #3 }
+          { \fp_zero:N \l__exsheets_question_bonus_fp }
+          { \fp_set:Nn \l__exsheets_question_bonus_fp { #2 } }
+      }
+  }
+\cs_new:Npn \__exsheets_read_points:n #1
+  { \__exsheets_read_points:w #1++ \q_stop }
+
+\NewDocumentEnvironment { question } { og }
+  {
+    \bool_set_true:N \l__exsheets_inside_question_bool
+    \bool_if:NT \l__exsheets_questions_use_bool
+      { \bool_gset_true:N \g__exsheets_questions_use_bool }
+    % Optionen:
+    \IfNoValueF { #1 } { \keys_set:nn { exsheets / question } { #1 } }
+    % Punktevergabe:
+    \IfNoValueTF { #2 }
+      {
+        \__exsheets_read_points:n { 0 }
+        \bool_if:NT \l__exsheets_points_questions_default_bool
+          {
+            \fp_set_eq:NN
+              \l__exsheets_question_points_fp
+              \l__exsheets_points_default_fp
+          }
+      }
+      { \__exsheets_read_points:n { #2 } }
+    % ID:
+    \int_gincr:N \g__exsheets_questions_id_int
+    \tl_if_blank:VTF \l__exsheets_questions_id_tl
+      {
+        \prop_gput:NVV \g__exsheets_questions_id_prop
+          \g__exsheets_questions_id_int
+          \g__exsheets_questions_id_int
+        \tl_gset:Nx \g__exsheets_questions_current_id_tl
+          { \int_use:N \g__exsheets_questions_id_int }
+      }
+      {
+        \prop_gput:NVV \g__exsheets_questions_id_prop
+          \l__exsheets_questions_id_tl
+          \g__exsheets_questions_id_int
+        \tl_gset:Nx \g__exsheets_questions_current_id_tl
+          { \tl_use:N \l__exsheets_questions_id_tl }
+      }
+    % Auswahl der Frage:
+    \__exsheets_select_question:V \g__exsheets_questions_current_id_tl
+    \bool_if:nT
+      {
+        \g__exsheets_questions_use_bool &&
+        !\l__exsheets_questions_deactivate_bool
+      }
+      {
+        \__exsheets_questions_use_classes:
+        \__exsheets_questions_use_topics:
+        \bool_if:nT
+          {
+            ( \l__exsheets_class_active_bool && \l__exsheets_topic_active_bool ) ||
+            ( \l__exsheets_class_active_bool && !\g__exsheets_use_topics_bool ) ||
+            ( !\g__exsheets_use_classes_bool && \l__exsheets_topic_active_bool ) ||
+            ( !\g__exsheets_use_classes_bool && !\g__exsheets_use_topics_bool )
+          }
+          { \refstepcounter{question} }
+        \cs_if_exist:NT \chapter
+          { \int_set:Nn \l__exsheets_counter_ch_int { \arabic{chapter} } }
+        \int_set:Nn \l__exsheets_counter_sec_int { \arabic{section} }
+        \int_set:Nn \l__exsheets_counter_qu_int { \arabic{question} }
+        \bool_if:nT
+          {
+            (
+              \l__exsheets_points_questions_default_bool &&
+              \l__exsheets_parse_points_bool
+            ) ||
+            (
+              \l__exsheets_parse_points_bool &&
+              \l__exsheets_questions_print_bool
+            )
+          }
+          {
+            \exsheets_add_points:V \l__exsheets_question_points_fp
+            \exsheets_add_bonus:V  \l__exsheets_question_bonus_fp
+          }
+        \bool_if:NT \l__exsheets_questions_print_bool
+          {
+            \bool_if:NTF \l__exsheets_exam_bool
+              { \tl_set_eq:NN \l__exsheets_title_tl \l__exsheets_questions_name_tl }
+              { \tl_set_eq:NN \l__exsheets_title_tl \l__exsheets_exsheets_name_tl }
+            \__exsheets_use_heading:VVVnn
+              \l__exsheets_heading_instance_tl
+              \l__exsheets_title_tl
+              \l__exsheets_qu_counter_interpretation_tl
+              { \l__exsheets_question_points_fp }
+              { \l__exsheets_question_bonus_fp }
+          }
+      }
+    \__exsheets_questions_internal:
+  }
+  { \end__exsheets_questions_internal: }
+
+% current question number:
+\prop_new:N \g__exsheets_question_number_prop
+
+\cs_new_protected:Npn \exsheets@save@number #1#2
+  { \expandafter\global\expandafter\edef\csname exsheets@question@#1\endcsname{#2} }
+
+\cs_new:Npn \__exsheets_save_number_in:N #1
+  {
+    \bool_if:NTF \l__exsheets_print_number_bool
+      {
+        \cs_if_exist:NTF \thechapter
+          {
+            \prop_gput:Nfx #1
+              { \int_use:N \g__exsheets_questions_id_int }
+              { \arabic{chapter}-\arabic{section}-\arabic{question} }
+            \iow_now:Nx \@auxout
+              {
+                \exsheets@save@number
+                  { \g__exsheets_questions_current_id_tl }
+                  { \arabic{chapter}-\arabic{section}-\arabic{question} }
+              }
+          }
+          {
+            \prop_gput:Nfx #1
+              { \int_use:N \g__exsheets_questions_id_int }
+              { -\arabic{section}-\arabic{question} }
+            \iow_now:Nx \@auxout
+              {
+                \exsheets@save@number
+                  { \g__exsheets_questions_current_id_tl }
+                  { -\arabic{section}-\arabic{question} }
+              }
+          }
+      }
+      {
+        \cs_if_exist:NTF \thechapter
+          {
+            \prop_gput:Nfx #1
+              { \int_use:N \g__exsheets_questions_id_int }
+              { @@@\arabic{chapter}-\arabic{section}-\arabic{question} }
+            \iow_now:Nx \@auxout
+              {
+                \exsheets@save@number
+                  { \g__exsheets_questions_current_id_tl }
+                  { @@@\arabic{chapter}-\arabic{section}-\arabic{question} }
+              }
+          }
+          {
+            \prop_gput:Nfx #1
+              { \int_use:N \g__exsheets_questions_id_int }
+              { @@@-\arabic{section}-\arabic{question} }
+            \iow_now:Nx \@auxout
+              {
+                \exsheets@save@number
+                  { \g__exsheets_questions_current_id_tl }
+                  { @@@-\arabic{section}-\arabic{question} }
+              }
+          }
+      }
+  }
+
+\cs_new:Npn \__exsheets_restore_number_from_and_do:Nnn #1#2#3
+  {
+    \prop_get:NnN #1 { #2 } \l__exsheets_tmpc_tl
+    \tl_if_eq:NNF \l__exsheets_tmpc_tl \q_no_value
+      {
+        \exp_after:wN
+        \__exsheets_read_number:w \l__exsheets_tmpc_tl \q_stop
+        #3
+      }
+    % use \exsheets_read_counter_settings:V \l__exsheets_qu_counter_format_tl
+    % afterwards to print the number
+  }
+\cs_generate_variant:Nn \__exsheets_restore_number_from_and_do:Nnn { NV }
+
+\NewDocumentCommand \QuestionNumber { m }
+  { \exsheets_question_number:c { exsheets@question@#1 } }
+
+\cs_new:Npn \exsheets_question_number:N #1
+  {
+    \cs_if_exist:NTF #1
+      {
+        \exp_after:wN \__exsheets_get_question_number:w #1 \q_stop
+        \ReadCounterPatternFrom [ exsheets ] \l__exsheets_qu_counter_pattern_tl
+      }
+      { \textbf{??} }
+  }
+\cs_generate_variant:Nn \exsheets_question_number:N { c }
+
+\cs_new:Npn \__exsheets_get_question_number:w #1-#2-#3 \q_stop
+  {
+    \cs_if_exist:NT \thechapter
+      { \int_set:Nn \l__exsheets_counter_ch_int { #1 } }
+    \int_set:Nn \l__exsheets_counter_sec_int { #2 }
+    \int_set:Nn \l__exsheets_counter_qu_int { #3 }
+  }
+
+% ----------------------------------------------------------------------------
+% title of a question:
+\input { exsheets_headings.def }
+\bool_if:NT \l__exsheets_load_headings_bool
+  {
+    \RequirePackage { amssymb }
+    \input { exsheets_headings.cfg }
+  }
+% #1: instance
+% #2: title
+% #3: number
+% #4: points
+% #5: bonus
+\cs_new_nopar:Npn \__exsheets_use_heading:nnnnn #1#2#3#4#5
+  {
+    \IfInstanceExistTF { exsheets-heading } { #1 }
+      { \UseInstance { exsheets-heading } { #1 } }
+      {
+        \msg_warning:nnx { exsheets} { headings } { #1 }
+        \UseInstance { exsheets-heading } { block }
+      }
+    { #2 } { #3 } { #4 } { #5 }
+  }
+\cs_generate_variant:Nn \__exsheets_use_heading:nnnnn { V , VV , VVV }
+
+\bool_new:N       \l__exsheets_exam_bool
+\bool_set_false:N \l__exsheets_exam_bool
+\bool_new:N       \l__exsheets_questions_runin_bool
+\bool_set_false:N \l__exsheets_questions_runin_bool
+
+% options for the questions:
+\keys_define:nn { exsheets / question }
+  {
+    type            .choice: ,
+    type / exam     .code:n      =
+      \bool_set_true:N \l__exsheets_exam_bool ,
+    type / exercise .code:n      =
+      \bool_set_false:N \l__exsheets_exam_bool ,
+    name            .code:n      =
+      \tl_set:Nn \l__exsheets_exsheets_name_tl { #1 }
+      \tl_set:Nn \l__exsheets_questions_name_tl { #1 } ,
+    print           .bool_set:N  = \l__exsheets_questions_print_bool ,
+    print           .default:n   = true ,
+    ID              .tl_set:N    = \l__exsheets_questions_id_tl ,
+    class           .code:n      =
+      \bool_set_true:N \l__exsheets_questions_class_bool
+      \tl_set:Nn \l__exsheets_questions_class_tl { #1 } ,
+    topic           .code:n      =
+      \bool_set_true:N \l__exsheets_questions_topic_bool
+      \tl_set:Nn \l__exsheets_questions_topic_tl { #1 } ,
+    use             .choice: ,
+    use / true      .code:n      =
+      \bool_gset_true:N \g__exsheets_questions_use_bool
+      \bool_set_true:N  \l__exsheets_questions_use_bool ,
+    use / false     .code:n      =
+      \bool_gset_false:N \g__exsheets_questions_use_bool
+      \bool_set_false:N  \l__exsheets_questions_use_bool ,
+    use             .default:n   = true ,
+    skip-below      .dim_set:N   = \l__exsheets_questions_skip_below_dim
+  }
+
+% ----------------------------------------------------------------------------
+% using ``metadata'':
+\cs_new:Npn \__exsheets_declare_question_property:n #1
+  {
+    \prop_new:c { g__exsheets_question_property_#1_prop }
+    \keys_define:nn { question / meta }
+      { #1 .code:n = \__exsheets_question_set_property:nn { #1 } { ##1 } }
+  }
+
+\cs_new_eq:NN \exsheets_declare_question_property:n
+  \__exsheets_declare_question_property:n
+
+\NewDocumentCommand \DeclareQuestionProperty { m }
+  { \exsheets_declare_question_property:n { #1 } }
+\@onlypreamble\DeclareQuestionProperty
+
+\NewDocumentCommand \SetQuestionProperties { m }
+  { \exsheets_set_question_properties:n { #1 } }
+
+\cs_new:Npn \__exsheets_set_question_properties:n #1
+  {
+    \@bsphack
+      \bool_if:NTF \l__exsheets_inside_question_bool
+        { \keys_set:nn { question / meta } { #1 } }
+        {
+          \msg_error:nnn { exsheets } { only-inside-question }
+            { \SetQuestionProperties }
+        }
+    \@esphack
+  }
+
+\cs_new_eq:NN \exsheets_set_question_properties:n
+  \__exsheets_set_question_properties:n
+
+\cs_new:Npn \__exsheets_question_set_property:nn #1#2
+  {
+    \prop_gput:cVn { g__exsheets_question_property_#1_prop }
+      \g__exsheets_questions_current_id_tl { #2 }
+  }
+
+\NewDocumentCommand \GetQuestionProperty { mm }
+  { \exsheets_get_question_property:nn { #1 } { #2 } }
+
+\cs_new:Npn \exsheets_get_question_property:nn #1#2
+  {
+    \prop_if_in:cnT { g__exsheets_question_property_#1_prop } { #2 }
+      { \prop_get:cn { g__exsheets_question_property_#1_prop } { #2 } }
+  }
+
+% ----------------------------------------------------------------------------
+% debug-Info:
+\bool_new:N       \l__exsheets_questions_debug_bool
+\bool_set_false:N \l__exsheets_questions_debug_bool
+
+\colorlet { exsheetsdebugcolor } { yellow }
+
+\cs_new_nopar:Npn \exsheets_questions_debug:
+  {
+    \bool_if:nT { \l__exsheets_questions_debug_bool && \l__exsheets_inside_question_bool }
+      {
+        \colorbox { exsheetsdebugcolor }
+          {
+            \group_begin:
+              \normalfont\normalsize\normalcolor
+              ID:~
+              \tl_if_blank:VTF \l__exsheets_questions_id_tl
+                { \int_use:N \g__exsheets_questions_id_int }
+                { \tl_use:N \l__exsheets_questions_id_tl }
+              \bool_if:NT \l__exsheets_questions_class_bool
+                { ,~CLASS:~ \tl_use:N \l__exsheets_questions_class_tl }
+              \bool_if:NT \l__exsheets_questions_topic_bool
+                { ,~TOPIC:~ \tl_use:N \l__exsheets_questions_topic_tl }
+            \group_end:
+          }
+      }
+  }
+
+\NewDocumentCommand \DebugExSheets { G{true} }
+  { \use:c { bool_set_#1:N } \l__exsheets_questions_debug_bool }
+
+% ----------------------------------------------------------------------------
+% include random/selected questions from a file:
+\bool_new:N      \l__exsheets_select_questions_bool
+\bool_new:N      \l__exsheets_include_all_bool
+\bool_new:N      \l__exsheets_include_random_bool
+\bool_set_true:N \l__exsheets_include_all_bool
+\prop_new:N      \g__exsheets_selected_questions_prop
+\clist_new:N     \l__exsheets_include_id_clist
+\int_new:N       \l__exsheets_include_random_int
+\int_zero:N      \l__exsheets_include_random_int
+\tl_new:N        \l__exsheets_random_seed_tl
+\tl_set:Nn       \l__exsheets_random_seed_tl { -1 }
+\newcounter      {exsheets@include@random}
+
+\cs_new:Npn \file_input_if_exist:n #1
+  { \file_if_exist:nT { #1 } { \file_input:n { #1 } } }
+
+\cs_if_exist:NF \prop_length:N
+  {
+    \cs_new:Npn \prop_length:N #1
+      {
+        \prop_length:NN #1 \l__exsheets_tmpa_int
+        \int_use:N \l__exsheets_tmpa_int
+      }
+  }
+
+\cs_new:Npn \prop_length:NN #1#2
+  {
+    \int_zero:N #2
+    \prop_map_inline:Nn #1
+      { \int_incr:N #2 }
+  }
+
+\NewDocumentCommand \includequestions { om }
+  {
+    \group_begin:
+      \IfNoValueF { #1 }
+        { \keys_set:nn { exsheets / include } { #1 } }
+      \exsheets_include_questions:n { #2 }
+    \group_end:
+  }
+
+\cs_new:Npn \exsheets_include_questions:n #1
+  {
+    \seq_set_split:Nnn \l__exsheets_tmpa_seq { , } { #1 }
+    \seq_map_inline:Nn \l__exsheets_tmpa_seq
+      {
+        \bool_set_true:N \l__exsheets_questions_deactivate_bool
+        \file_input_if_exist:n { ##1 }
+        \bool_if:NT \l__exsheets_questions_debug_bool
+          {
+            \colorbox { exsheetsdebugcolor }
+              {
+                The~file~ ` \texttt { \tl_to_str:n { ##1 } } ' ~contains~
+                \prop_length:N \g__exsheets_selected_questions_prop \c_space_tl
+                questions.
+              }
+              \par
+          }
+        \bool_set_false:N \l__exsheets_questions_deactivate_bool
+        \__exsheets_select_question_random:n { ##1 }
+        \file_input_if_exist:n { ##1 }
+        \prop_gclear:N \g__exsheets_selected_questions_prop
+        \clist_clear:N \l__exsheets_include_id_clist
+      }
+  }
+
+% options:
+%  - IDs=<list of IDs>
+%  - all=true|false    % default when no option is given
+%  - random=<num>
+%  - seed=<num>        % set the seed for the random selection
+\keys_define:nn { exsheets / include }
+  {
+    all    .bool_set:N = \l__exsheets_include_all_bool ,
+    IDs    .code:n     =
+      \bool_set_false:N \l__exsheets_include_all_bool
+      \bool_set_false:N \l__exsheets_include_random_bool
+      \clist_set:Nn \l__exsheets_include_id_clist { #1 } ,
+    random .code:n     =
+      \bool_set_false:N \l__exsheets_include_all_bool
+      \bool_set_true:N  \l__exsheets_include_random_bool
+      \int_set:Nn \l__exsheets_include_random_int { #1 } ,
+    seed   .tl_set:N   = \l__exsheets_random_seed_tl
+  }
+
+\cs_new:Npn \__exsheets_select_question:n #1
+  {
+    \bool_if:NTF \l__exsheets_questions_deactivate_bool
+      {
+        \prop_gput:Nnn \g__exsheets_selected_questions_prop
+          { #1 } { \__exsheets_dummy: }
+      }
+      {
+        \bool_if:NF \l__exsheets_include_all_bool
+          { \__exsheets_select_question_by_id:n { #1 } }
+      }
+  }
+\cs_generate_variant:Nn \__exsheets_select_question:n { V }
+
+\cs_new:Npn \__exsheets_select_question_by_id:n #1
+  {
+%     \clist_show:N \l__exsheets_include_id_clist
+    \clist_if_in:NnTF
+      \l__exsheets_include_id_clist
+      { #1 }
+      { \bool_gset_true:N  \g__exsheets_questions_use_bool }
+      { \bool_gset_false:N \g__exsheets_questions_use_bool }
+  }
+
+\cs_new:Npn \__exsheets_select_question_random:n #1
+  {
+    \bool_if:NT \l__exsheets_include_random_bool
+      {
+        \prop_length:NN \g__exsheets_selected_questions_prop \l__exsheets_tmpa_int
+        \int_compare:nTF { \l__exsheets_include_random_int > \l__exsheets_tmpa_int }
+          {
+            \msg_warning:nnxxx { exsheets } { random }
+              { \int_use:N \l__exsheets_include_random_int }
+              { #1 }
+              { \int_use:N \l__exsheets_tmpa_int }
+            \bool_set_true:N \l__exsheets_include_all_bool
+          }
+          {
+            \group_begin:
+              \WarningsOff[lcg]
+              \tl_set:Nx \l__exsheets_tmpa_tl { \int_use:N \l__exsheets_tmpa_int }
+              \reinitrand
+                [
+                  first   = 1 ,
+                  last    = \l__exsheets_tmpa_tl ,
+                  counter = exsheets@include@random ,
+                  seed    = \l__exsheets_random_seed_tl ,
+                  quiet   = y
+                ]
+              \int_zero:N \l__exsheets_tmpa_int
+              \int_do_while:nNnn \l__exsheets_tmpa_int < \l__exsheets_include_random_int
+                {
+                  \rand
+                  \int_zero:N \l__exsheets_tmpb_int
+                  \prop_map_inline:Nn \g__exsheets_selected_questions_prop
+                    {
+                      \int_incr:N \l__exsheets_tmpb_int
+                      \int_compare:nT
+                        { \l__exsheets_tmpb_int = \value{exsheets@include@random} }
+                        {
+                          \tl_set_rescan:Nnn \l__exsheets_tmpa_tl {} { ##1 }
+                          \clist_if_in:NVTF \l__exsheets_include_id_clist \l__exsheets_tmpa_tl
+                            { \int_decr:N \l__exsheets_tmpb_int }
+                            {
+                              \clist_gput_right:NV \l__exsheets_include_id_clist
+                                \l__exsheets_tmpa_tl
+                              \prop_map_break:
+                            }
+                        }
+                    }
+                    \clist_remove_duplicates:N \l__exsheets_include_id_clist
+                    \int_set:Nn \l__exsheets_tmpa_int
+                      { \clist_count:N \l__exsheets_include_id_clist }
+                }
+              \WarningsOn[lcg]
+            \group_end:
+          }
+      }
+  }
+
+\NewDocumentCommand \PrintIfIncludeActiveTF { mm }
+  { \bool_if:NTF \l__exsheets_questions_deactivate_bool { #2 } { #1 } }
+
+\NewDocumentCommand \PrintIfIncludeActiveT { }
+  { \bool_if:NF \l__exsheets_questions_deactivate_bool }
+
+\NewDocumentCommand \PrintIfIncludeActiveF { }
+  { \bool_if:NT \l__exsheets_questions_deactivate_bool }
+
+% ----------------------------------------------------------------------------
+% die 'solution' Umgebung:
+\bool_new:N       \l__exsheets_solutions_print_bool
+\bool_set_false:N \l__exsheets_solutions_print_bool
+\bool_new:N       \l__exsheets_solutions_print_here_bool
+\bool_set_false:N \l__exsheets_solutions_print_here_bool
+\bool_new:N       \l__exsheets_solutions_print_section_bool
+\bool_set_false:N \l__exsheets_solutions_print_section_bool
+\bool_new:N       \l__exsheets_solutions_print_chapter_bool
+\bool_set_false:N \l__exsheets_solutions_print_chapter_bool
+\bool_new:N       \l__exsheets_solutions_print_all_bool
+\bool_set_false:N \l__exsheets_solutions_print_all_bool
+
+% \prop_new:N       \g__exsheets_question_number_prop
+\prop_new:N       \g__exsheets_solutions_content_prop
+\prop_new:N       \g__exsheets_solutions_questions_id_prop
+\prop_new:N       \g__exsheets_solutions_names_prop
+
+\tl_new:N         \l__exsheets_solutions_name_tl
+\tl_set:Nn        \l__exsheets_solutions_name_tl { Solution }
+
+\cs_new:Npn \__exsheets_save_solution:n #1
+  {
+    % save for later use
+    \prop_gput:Nff \g__exsheets_solutions_content_prop
+      { \int_use:N \g__exsheets_questions_id_int }
+      { #1 }
+    \prop_gput:Nff \g__exsheets_solutions_questions_id_prop
+      { \int_use:N \g__exsheets_questions_id_int }
+      { \tl_use:N \g__exsheets_questions_current_id_tl }
+    \prop_gput:Nff \g__exsheets_solutions_names_prop
+      { \int_use:N \g__exsheets_questions_id_int }
+      { \tl_use:N \l__exsheets_solutions_name_tl }
+    % print here
+    \bool_if:NT \l__exsheets_solutions_print_here_bool
+      {
+        \int_set:Nn \l__exsheets_counter_qu_int { \arabic{question} }
+        \__exsheets_solutions_name:VV
+          \l__exsheets_qu_counter_interpretation_tl
+          \l__exsheets_solutions_name_tl
+        \use:n { #1 } \par
+        \dim_compare:nNnT { \parskip } = { 0pt }
+          { \exsheets_glue:N \l__exsheets_solutions_skip_below_dim }
+      }
+  }
+\cs_generate_variant:Nn \prop_gput:Nnn { Nff,Nfx,Nfn,Nxx }
+\cs_generate_variant:Nn \__exsheets_save_solution:n { V }
+
+\NewEnviron { __exsheets_solution_int: }
+  {
+    \bool_if:nT { \g__exsheets_questions_use_bool && \l__exsheets_solutions_use_bool }
+      {
+        \cspreto { BODY } { \ifhmode \fi }% what's that good for?
+        \__exsheets_save_solution:V \BODY
+      }
+  }
+
+\bool_new:N       \l__exsheets_inside_solution_bool
+\bool_set_false:N \l__exsheets_inside_solution_bool
+
+\NewDocumentEnvironment { solution } { o }
+  {
+    \__exsheets_solutions_use_classes:
+    \__exsheets_solutions_use_topics:
+    \bool_if:NT \l__exsheets_questions_deactivate_bool
+      { \bool_set_false:N \l__exsheets_solutions_use_bool }
+    \bool_if:NT \l__exsheets_solutions_use_bool
+      {
+        \bool_set_true:N \l__exsheets_inside_solution_bool
+        \IfNoValueF { #1 } { \keys_set:nn { exsheets / solution } { #1 } }
+      }
+    \__exsheets_solution_int:
+  }
+  { \end__exsheets_solution_int: }
+
+\bool_new:N       \l__exsheets_solutions_runin_bool
+\bool_set_false:N \l__exsheets_solutions_runin_bool
+
+\cs_new_nopar:Npn \__exsheets_solutions_name:nn #1#2
+  {
+    \__exsheets_use_heading:Vnnnn
+      \l__exsheets_heading_instance_tl
+      { #2 } { #1 } { 0 } { 0 }
+  }
+\cs_generate_variant:Nn \__exsheets_solutions_name:nn { VV }
+
+\tl_new:N  \l__exsheets_solutions_name_style_tl
+\tl_set:Nn \l__exsheets_solutions_name_style_tl { \normalsize \bfseries }
+
+\cs_new:Npn \exsheets_solutions_name_style:n #1
+  { \l__exsheets_solutions_name_style_tl #1 }
+
+% ----------------------------------------------------------------------------
+% print solutions:
+% save section / chapter counter:
+\cs_new:Npn \__exsheets_exlabel:n #1
+  {
+    \@bsphack
+    \iow_now:Nx \@auxout
+      {
+        \token_to_str:N \newlabel { exse:#1 }
+          { { \arabic { section } } { \thepage } }
+      }
+    \cs_if_exist:NT \thechapter
+      {
+        \iow_now:Nx \@auxout
+          {
+            \token_to_str:N \newlabel { exch:#1 }
+              { { \arabic { chapter } } { \thepage } }
+          }
+      }
+    \@esphack
+  }
+
+% user command:
+\cs_new_eq:NN \exlabel \__exsheets_exlabel:n
+
+% adapt \label, maybe do this _after_ BeginDocument:
+\bool_if:NT \l__exsheets_solutions_by_ref_bool
+  {
+    \cs_new_eq:NN \__exsheets_saved_label:n \label
+    \cs_set:Npn \label #1
+      { \__exsheets_saved_label:n { #1 } \__exsheets_exlabel:n { #1 } }
+  }
+
+% this is like \ref from latex.ltx
+\cs_new:Npn \__exsheets_ref:n #1
+  {
+    \cs_if_exist:cTF { r@#1 }
+     { \__exsheets_ref_aux:n { #1 } }
+     {
+       \protect\G@refundefinedtrue
+       1
+       \@latex@warning{exlabel `#1' on page \thepage \space undefined}%
+     }
+  }
+
+\cs_new:Npn \__exsheets_ref_aux:n #1
+  { \exp_after:wN \exp_after:wN \exp_after:wN \use_i:nn \cs:w r@#1 \cs_end: }
+
+\cs_new_eq:NN \exref \__exsheets_ref:n
+
+% user command:
+\NewDocumentCommand \printsolutions { O{all} }
+  { \exsheets_print_solutions:n { #1 } }
+
+% internal command:
+\cs_new:Npn \exsheets_print_solutions:n #1
+  {
+    \group_begin:
+      \bool_set_true:N \l__exsheets_solutions_print_bool
+      \bool_set_true:N \l__exsheets_inside_solution_bool
+      \cs_set:Npn \S ##1 { \exref { exse:##1 } }
+      \cs_set:Npn \C ##1 { \exref { exch:##1 } }
+      \keys_set:nn { exsheets / exsheets_print_solutions } { #1 }
+    \group_end:
+  }
+
+\keys_define:nn { exsheets }
+  {
+    exsheets_print_solutions           .choice: ,
+    exsheets_print_solutions / section .code:n    =
+      { \exsheets_print_solutions_section:n { #1 } } ,
+    exsheets_print_solutions / chapter .code:n    =
+      { \exsheets_print_solutions_chapter:n { #1 } } ,
+    exsheets_print_solutions / all     .code:n    =
+      { \exsheets_print_solutions_all: } ,
+    exsheets_print_solutions / byID    .code:n    =
+      { \exsheets_print_solutions_byID:n { #1 } }
+  }
+
+\int_new:N \l__exsheets_counter_ch_int
+\int_new:N \l__exsheets_counter_sec_int
+\int_new:N \l__exsheets_counter_qu_int
+
+\cs_new:Npn \__exsheets_print_solution_if:nn #1#2
+  {
+    \exp_args:No \int_compare:nT { #2 }
+      {
+        \prop_get:NnN \g__exsheets_solutions_names_prop
+          { #1 } \l__exsheets_tmpa_tl
+        \prop_get:NnN \g__exsheets_solutions_content_prop
+          { #1 } \l__exsheets_tmpb_tl
+        \eSaveCounterPatternFrom [ exsheets ]
+          \l__exsheets_current_pattern_interpretation_tl
+          \l__exsheets_current_pattern_tl
+          \l__exsheets_qu_counter_pattern_tl
+        \exsheets_solutions_print_name:VV
+          \l__exsheets_current_pattern_tl
+          \l__exsheets_tmpa_tl
+        \tl_use:N \l__exsheets_tmpb_tl \par
+        \dim_compare:nNnT { \parskip } = { 0pt }
+          { \exsheets_glue:N \l__exsheets_solutions_skip_below_dim }
+      }
+  }
+
+% print by section:
+\cs_new:Npn \exsheets_print_solutions_section:n #1
+  {
+    \tl_if_blank:nTF { #1 }
+      {
+        \prop_map_inline:Nn \g__exsheets_question_number_prop
+          {
+            \prop_if_in:NnT \g__exsheets_solutions_names_prop { ##1 }
+              {
+                \__exsheets_print_solutions_section:nnn { ##1 } { ##2 }
+                  { \arabic{section} }
+              }
+          }
+      }
+      {
+        \clist_map_inline:nn { #1 }
+          { \__exsheets_print_solutions_by_section:w ##1-- \q_stop }
+      }
+  }
+
+\cs_new:Npn \__exsheets_print_solutions_by_section:w #1-#2-#3 \q_stop
+  {
+    % wenn #3=-, dann range-Input
+    \tl_if_eq:nnTF { #3 } { - }
+      {
+        \int_zero:N \l__exsheets_tmpa_int
+        \int_set_eq:NN \l__exsheets_tmpb_int \c_ten_thousand
+        \tl_if_blank:nF { #1 } { \int_set:Nn \l__exsheets_tmpa_int { #1 } }
+        \tl_if_blank:nF { #2 } { \int_set:Nn \l__exsheets_tmpb_int { #2 } }
+        \int_do_while:nn { \l__exsheets_tmpa_int <= \l__exsheets_tmpb_int }
+          {
+            \prop_map_inline:Nn \g__exsheets_question_number_prop
+              {
+                \prop_if_in:NnT \g__exsheets_solutions_names_prop { ##1 }
+                  {
+                    \__exsheets_print_solutions_section:nnn
+                      { ##1 } { ##2 } { \l__exsheets_tmpa_int }
+                  }
+              }
+            \int_incr:N \l__exsheets_tmpa_int
+          }
+      }
+      {
+        \prop_map_inline:Nn \g__exsheets_question_number_prop
+          {
+            \prop_if_in:NnT \g__exsheets_solutions_names_prop { ##1 }
+              { \__exsheets_print_solutions_section:nnn { ##1 } { ##2 } { #1 } }
+          }
+      }
+  }
+
+\cs_new:Npn \__exsheets_print_solutions_section:nnn #1#2#3
+  {
+    \__exsheets_read_number:w #2 \q_stop
+    \__exsheets_print_solution_if:nn { #1 }
+      { \l__exsheets_counter_sec_int = #3 }
+  }
+
+% print by chapter:
+\cs_new:Npn \exsheets_print_solutions_chapter:n #1
+  {
+    \tl_if_blank:nTF { #1 }
+      {
+        \prop_map_inline:Nn \g__exsheets_question_number_prop
+          {
+            \prop_if_in:NnT \g__exsheets_solutions_names_prop { ##1 }
+              {
+                \__exsheets_print_solutions_chapter:nnn { ##1 } { ##2 }
+                  { \arabic{chapter} }
+              }
+          }
+      }
+      {
+        \clist_map_inline:nn { #1 }
+          { \__exsheets_print_solutions_by_chapter:w ##1-- \q_stop }
+      }
+  }
+
+\cs_new:Npn \__exsheets_print_solutions_by_chapter:w #1-#2-#3 \q_stop
+  {
+    % wenn #3=-, dann range-Input
+    \tl_if_eq:nnTF { #3 } { - }
+      {
+        \int_zero:N \l__exsheets_tmpa_int
+        \int_set_eq:NN \l__exsheets_tmpb_int \c_ten_thousand
+        \tl_if_blank:nF { #1 } { \int_set:Nn \l__exsheets_tmpa_int { #1 } }
+        \tl_if_blank:nF { #2 } { \int_set:Nn \l__exsheets_tmpb_int { #2 } }
+        \int_do_while:nn { \l__exsheets_tmpa_int <= \l__exsheets_tmpb_int }
+          {
+            \prop_map_inline:Nn \g__exsheets_question_number_prop
+              {
+                \prop_if_in:NnT \g__exsheets_solutions_names_prop { ##1 }
+                  {
+                    \__exsheets_print_solutions_chapter:nnn
+                      { ##1 } { ##2 } { \l__exsheets_tmpa_int }
+                  }
+              }
+            \int_incr:N \l__exsheets_tmpa_int
+          }
+      }
+      {
+        \prop_map_inline:Nn \g__exsheets_question_number_prop
+          {
+            \prop_if_in:NnT \g__exsheets_solutions_names_prop { ##1 }
+              { \__exsheets_print_solutions_chapter:nnn { ##1 } { ##2 } { #1 } }
+          }
+      }
+  }
+
+\cs_new:Npn \__exsheets_print_solutions_chapter:nnn #1#2#3
+  {
+    \__exsheets_read_number:w #2 \q_stop
+    \__exsheets_print_solution_if:nn { #1 }
+      { \l__exsheets_counter_ch_int = #3 }
+  }
+
+% print all:
+\cs_new:Npn \exsheets_print_solutions_all:
+  {
+    \prop_map_function:NN \g__exsheets_question_number_prop
+      \__exsheets_print_solutions_all:nn
+  }
+
+\cs_new:Npn \__exsheets_print_solutions_all:nn #1#2
+  {
+    \__exsheets_read_number:w #2 \q_stop
+    \prop_get:NnNT \g__exsheets_solutions_names_prop
+      { #1 } \l__exsheets_tmpa_tl
+      {
+        \tl_set_eq:NN \l__exsheets_solutions_name_tl \l__exsheets_tmpa_tl
+        \prop_get:NnN \g__exsheets_solutions_content_prop
+          { #1 } \l__exsheets_tmpb_tl
+        \eSaveCounterPatternFrom [ exsheets ]
+          \l__exsheets_current_pattern_interpretation_tl
+          \l__exsheets_current_pattern_tl
+          \l__exsheets_qu_counter_pattern_tl
+        \exsheets_solutions_print_name:VV
+          \l__exsheets_current_pattern_tl
+          \l__exsheets_tmpa_tl
+        \tl_use:N \l__exsheets_tmpb_tl \par
+        \dim_compare:nNnT { \parskip } = { 0pt }
+          { \exsheets_glue:N \l__exsheets_solutions_skip_below_dim }
+      }
+  }
+
+% print by ID:
+\seq_new:N \l__exsheets_solutions_byID_seq
+\cs_new:Npn \exsheets_print_solutions_byID:n #1
+  {
+    \seq_set_split:Nnn \l__exsheets_solutions_byID_seq { , } { #1 }
+    \seq_clear:N \l__exsheets_tmpa_seq
+    \seq_map_inline:Nn \l__exsheets_solutions_byID_seq
+      {
+        \prop_get:NnN \g__exsheets_questions_id_prop
+          { ##1 } \l__exsheets_tmpa_tl
+        \seq_put_right:NV \l__exsheets_tmpa_seq \l__exsheets_tmpa_tl
+      }
+    \bool_if:NT \l__exsheets_print_byID_sorted_bool
+      {
+        \seq_sort:Nn \l__exsheets_tmpa_seq
+          {
+            \int_compare:nNnTF { ##1 } > { ##2 }
+              { \sort_reversed: }
+              { \sort_ordered: }
+          }
+      }
+    \seq_map_inline:Nn \l__exsheets_tmpa_seq
+      {
+        \group_begin:
+          \tl_if_eq:nnF { ##1 } { \q_no_value }
+            {
+              \prop_get:NnNT \g__exsheets_solutions_names_prop
+                { ##1 } \l__exsheets_tmpa_tl
+                {
+                  \prop_get:NnN \g__exsheets_solutions_content_prop
+                    { ##1 } \l__exsheets_tmpb_tl
+                  \__exsheets_restore_number_from_and_do:Nnn
+                    \g__exsheets_question_number_prop
+                    { ##1 }
+                    {
+                      \eSaveCounterPatternFrom [ exsheets ]
+                        \l__exsheets_current_pattern_interpretation_tl
+                        \l__exsheets_current_pattern_tl
+                        \l__exsheets_qu_counter_pattern_tl
+                      \exsheets_solutions_print_name:VV
+                        \l__exsheets_current_pattern_tl
+                        \l__exsheets_tmpa_tl
+                      \tl_use:N \l__exsheets_tmpb_tl \par
+                      \dim_compare:nNnT { \parskip } = { 0pt }
+                        { \exsheets_glue:N \l__exsheets_solutions_skip_below_dim }
+                    }
+                }
+            }
+        \group_end:
+      }
+  }
+
+\cs_new_nopar:Npn \__exsheets_read_number:w #1-#2-#3 \q_stop
+  {
+    \int_zero:N \l__exsheets_counter_ch_int
+    \int_zero:N \l__exsheets_counter_sec_int
+    \int_zero:N \l__exsheets_counter_qu_int
+    \tl_if_in:nnF { #1 } { @@@ }
+      {
+        \tl_if_blank:nF { #1 }
+          { \int_set:Nn \l__exsheets_counter_ch_int { #1 } }
+      }
+    \int_set:Nn \l__exsheets_counter_sec_int { #2 }
+    \int_set:Nn \l__exsheets_counter_qu_int { #3 }
+  }
+
+\cs_new_nopar:Npn \exsheets_solutions_print_name:nn #1#2
+  {
+    \tl_set_rescan:Nnn \l__exsheets_tmpa_tl
+      { \char_set_catcode_letter:N \@ } { #1 }
+    \tl_if_in:nnTF { #1 } { @@@ }
+      { \__exsheets_solutions_name:nn { } { #2 } }
+      { \__exsheets_solutions_name:nn { #1 } { #2  } }
+    \tex_penalty:D \c_ten_thousand
+  }
+\cs_generate_variant:Nn \exsheets_solutions_print_name:nn { VV }
+
+\cs_new:Npn \PrintSolutionsTF
+  { \bool_if:NTF \l__exsheets_solutions_print_bool }
+\cs_new:Npn \PrintSolutionsT
+  { \bool_if:NT \l__exsheets_solutions_print_bool }
+\cs_new:Npn \PrintSolutionsF
+  { \bool_if:NF \l__exsheets_solutions_print_bool }
+
+\bool_new:N      \l__exsheets_print_byID_sorted_bool
+\bool_set_true:N \l__exsheets_print_byID_sorted_bool
+
+\keys_define:nn { exsheets / solution }
+  {
+    print           .choice: ,
+    print / true    .code:n     =
+      {
+        \bool_set_true:N  \l__exsheets_solutions_print_bool
+        \bool_set_true:N  \l__exsheets_solutions_print_here_bool
+        \bool_set_false:N \l__exsheets_solutions_print_section_bool
+        \bool_set_false:N \l__exsheets_solutions_print_chapter_bool
+        \bool_set_false:N \l__exsheets_solutions_print_all_bool
+      } ,
+    print / false   .code:n     =
+      {
+        \bool_set_false:N \l__exsheets_solutions_print_bool
+      } ,
+    print           .default:n  = true ,
+    name            .tl_set:N   = \l__exsheets_solutions_name_tl ,
+    sorted          .bool_set:N = \l__exsheets_print_byID_sorted_bool ,
+    skip-below      .dim_set:N  = \l__exsheets_solutions_skip_below_dim
+  }
+
+% ----------------------------------------------------------------------------
+% the `tasks' list
+\input { exsheets_tasks.def }
+\bool_if:NT \l__exsheets_load_tasks_bool
+  {
+    \RequirePackage { amssymb }
+    \input { exsheets_tasks.cfg }
+  }
+
+% ----------------------------------------------------------------------------
+% the \blank{<words>} command
+\RequirePackage { ulem } \normalem
+\dim_new:N  \l__exsheets_blank_dim
+\box_new:N  \l__exsheets_blank_box
+\bool_new:N \l__exsheets_blank_width_bool
+
+\cs_new_nopar:Npn \exsheets_write_blank:n #1 { #1 }
+\cs_set_eq:NN \exsheets_write_blank:n \uline
+
+\keys_define:nn { exsheets / blank }
+  {
+    style          .choice: ,
+    style / line   .code:n =
+      { \cs_set_eq:NN \exsheets_write_blank:n \uline } ,
+    style / wave   .code:n =
+      { \cs_set_eq:NN \exsheets_write_blank:n \uwave } ,
+    style / dline  .code:n =
+      { \cs_set_eq:NN \exsheets_write_blank:n \uuline } ,
+    style / dotted .code:n =
+      { \cs_set_eq:NN \exsheets_write_blank:n \dotuline } ,
+    style / dashed .code:n =
+      { \cs_set_eq:NN \exsheets_write_blank:n \dashuline } ,
+    width          .code:n =
+      {
+        \bool_set_true:N \l__exsheets_blank_width_bool
+        \dim_set:Nn \l__exsheets_blank_dim { #1 }
+      }
+  }
+
+\NewDocumentCommand \blank { o m }
+  {
+    \group_begin:
+      \IfNoValueF { #1 } { \keys_set:nn { exsheets / blank } { #1 } }
+      \exsheets_blank:n { #2 }
+    \group_end:
+  }
+
+\cs_new:Npn \exsheets_blank:n #1
+  {
+    \box_clear:N \l__exsheets_blank_box
+    \hbox_set:Nn \l__exsheets_blank_box { #1 }
+    \bool_if:NTF \l__exsheets_inside_solution_bool
+      { \exsheets_write_blank:n { #1 } }
+      {
+        \bool_if:NTF \l__exsheets_blank_width_bool
+          { \__exsheets_blank_skip:N \l__exsheets_blank_dim }
+          { \__exsheets_blank_skip:n { \box_wd:N \l__exsheets_blank_box } }
+      }
+  }
+
+\cs_new:Npn \__exsheets_blank_skip:N #1
+  {
+    \dim_set:Nn \l__exsheets_tmpa_dim { #1 }
+    \dim_compare:nTF { \l__exsheets_tmpa_dim > 2em }
+      {
+        \exsheets_write_blank:n { \skip_horizontal:n { 1em } }
+        \dim_sub:Nn \l__exsheets_tmpa_dim { 2em }
+        \dim_do_while:nn { \l__exsheets_tmpa_dim > \c_zero_dim }
+          {
+            \tex_penalty:D \hyphenpenalty
+            \dim_compare:nTF { \l__exsheets_tmpa_dim < 1pt }
+              { \exsheets_write_blank:n { \skip_horizontal:N \l__exsheets_tmpa_dim } }
+              { \exsheets_write_blank:n { \skip_horizontal:n { 1pt } } }
+            \dim_sub:Nn \l__exsheets_tmpa_dim { 1pt }
+          }
+        \exsheets_write_blank:n { \skip_horizontal:n { 1em } }
+      }
+      { \exsheets_write_blank:n { \skip_horizontal:N \l__exsheets_tmpa_dim } }
+  }
+\cs_generate_variant:Nn \__exsheets_blank_skip:N { n }
+
+% the following code from Heiko Oberdieck in d.c.t.t served as inspiration
+% and basis for the \blank command:
+% 
+% \makeatletter
+% \newcommand*{\luecke}{%
+%   \begingroup
+%     \setlength{\dimen@}{6cm}%
+%     \ifdim\dimen@>2em %
+%       \underline{\hspace{1em}}%
+%       \advance\dimen@ by -2em\relax
+%       \@whiledim\dimen@>0pt\do{%
+%         \penalty\hyphenpenalty
+%         \ifdim\dimen@<1pt %
+%           \underline{\hspace{\dimen@}}%
+%         \else
+%           \underline{\hspace{1pt}}%
+%         \fi
+%         \advance\dimen@ by -1pt %
+%       }%
+%       \underline{\hspace{1em}}%
+%     \else
+%       \underline{\hspace{\dimen@}}%
+%     \fi
+%   \endgroup
+%   \xspace
+% }
+% \makeatother
+
+% ----------------------------------------------------------------------------
+% SETUP
+\NewDocumentCommand \SetupExSheets { o m }
+  {
+    \IfNoValueTF { #1 }
+      { \keys_set:nn { exsheets } { #2 } }
+      { \keys_set:nn { exsheets / #1 } { #2 } }
+  }
+
+% ----------------------------------------------------------------------------
+% Sprachanpassungen
+\file_if_exist:nT { translations.sty }
+  {
+    \RequirePackage { translations }
+    % translation for the exercises
+    \DeclareTranslation { English  } { exsheets-exercise-name } { Exercise     }
+    \DeclareTranslation { British  } { exsheets-exercise-name } { Exercise     }
+    \DeclareTranslation { American } { exsheets-exercise-name } { Exercise     }
+    \DeclareTranslation { French   } { exsheets-exercise-name } { Exercise     }
+    \DeclareTranslation { German   } { exsheets-exercise-name } { \"Ubung      }
+    \DeclareTranslation { Italian  } { exsheets-exercise-name } { Esercizio    }
+    \DeclareTranslation { Spanish  } { exsheets-exercise-name } { Ejercicio    }
+    \DeclareTranslation { Catalan  } { exsheets-exercise-name } { Exercir      }
+    \DeclareTranslation { Turkish  } { exsheets-exercise-name } { Egzersiz     }
+    % translation for the question
+    \DeclareTranslation { English  } { exsheets-question-name } { Question     }
+    \DeclareTranslation { British  } { exsheets-question-name } { Question     }
+    \DeclareTranslation { American } { exsheets-question-name } { Question     }
+    \DeclareTranslation { French   } { exsheets-question-name } { Question     }
+    \DeclareTranslation { German   } { exsheets-question-name } { Aufgabe      }
+    \DeclareTranslation { Italian  } { exsheets-question-name } { Questione    }
+    \DeclareTranslation { Spanish  } { exsheets-question-name } { Pregunta     }
+    \DeclareTranslation { Catalan  } { exsheets-question-name } { Q\"uesti\'o  }
+    \DeclareTranslation { Turkish  } { exsheets-question-name } { Soru         }
+    % translation for the solutions
+    \DeclareTranslation { English  } { exsheets-solution-name } { Solution     }
+    \DeclareTranslation { British  } { exsheets-solution-name } { Solution     }
+    \DeclareTranslation { American } { exsheets-solution-name } { Solution     }
+    \DeclareTranslation { French   } { exsheets-solution-name } { Solution     }
+    \DeclareTranslation { German   } { exsheets-solution-name } { L\"osung     }
+    \DeclareTranslation { Italian  } { exsheets-solution-name } { Soluzione    }
+    \DeclareTranslation { Spanish  } { exsheets-solution-name } { Soluci\'on   }
+    \DeclareTranslation { Catalan  } { exsheets-solution-name } { Soluci\'o    }
+    \DeclareTranslation { Turkish  } { exsheets-solution-name } { \c C\"oz\"um }
+    % the actual translating
+    \tl_set:Nn \l__exsheets_exsheets_name_tl
+      { \GetTranslation { exsheets-exercise-name } }
+    \tl_set:Nn \l__exsheets_questions_name_tl
+      { \GetTranslation { exsheets-question-name } }
+    \tl_set:Nn \l__exsheets_solutions_name_tl
+      { \GetTranslation { exsheets-solution-name } }
+  }
+
+% ----------------------------------------------------------------------------
+% save total points in .aux file to make it available for \allpoints anywhere
+\AtEndDocument
+  {
+    \iow_now:Nx \@auxout
+      {
+        \exp_not:N \exsheets@sum@of@points
+          { \fp_eval:n { \g__exsheets_points_sum_fp } }
+        \exp_not:N \exsheets@sum@of@bonus
+          { \fp_eval:n { \g__exsheets_bonus_sum_fp } }
+      }
+  }
+
+% ----------------------------------------------------------------------------
+% load custom configuration
+\file_if_exist:nT { exsheets_configurations.cfg }
+  {
+    \AtBeginDocument
+      {
+        \msg_info:nn { exsheets } { loading-configurations }
+        \file_input:n { exsheets_configurations.cfg }
+      }
+  }
+
+\tex_endinput:D
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+HISTORY:
+2011/11/23 v0.1pre     - first upload to bitbucket and all changes until
+                         considered stable enough/ready to be called 0.1alpha.
+                         There'll be no further descriptions until then.
+2012/06/08 v0.1alpha   - first hopefully stable version
+2012/06/11 v0.1alpha-a - added headings instances, slightly rewritten
+                         `exercises-tasks' object and `tasks' environment
+2012/06/11 v0.1alpha-b - added `multiplechoice' instance and `load-tasks' option
+2012/06/12 v0.1alpha-c - renamed from `exercises' into `ExSheets'
+2012/06/15 v0.1alpha-d - added more flexible solution printing method
+2012/06/15 v0.1beta    - filled in some blanks in the documentation, now we need
+                         some testing!
+2012/09/07 v0.1beta-a  - adjustments to the updated l3kernel
+2012/09/08 v0.1beta-b  - sort solutions printed with the `byID' key
+2012/09/16 v0.1beta-c  - renamed option `questions-counter-format' into
+                         `counter-format'
+2012/09/19 v0.1beta-d  - added `topic' key, provide \includequestions with options
+                         `all' and `IDs'
+2012/09/24 v0.1beta-e  - added question properties and improved random question
+                         selection
+2012/09/27 v0.1        - added two headings instances, new option `headings-format'
+                       - small changes in the definition of the `exsheets-headings'
+                         object
+                       - preliminary version of totoc options. Unfortunatly
+                         \exsheets@recover@number is not expandable => no
+                         hyperref support
+2012/09/30 v0.2beta    - version numbering gone crazy! this will now stay 0.2beta
+                         until upload to CTAN (v0.2)
+                       - integrated packages `translations' and `cntformats':
+                         trnslt: provide expandable version of `translator's
+                           \translate
+                         cntfmts: outsourced previous counter formatting commands;
+                           should now be usable in other packages, too, and
+                           simplified definitions in `ExSheets'
+                       - thanks to `translations' and `cntformats' the `totoc'
+                         option now works with `hyperref'
+2012/10/05 v0.2        - removed \sumpoints and moved the functionality to
+                         \totalpoints*
+                       - changed meaning of \addpoints* and moved former
+                         functionality to \points
+                       - added bonus point functionality including \addbonus,
+                         \bonus, \bonussum, \pointssum, \currentpointssum,
+                         \currentbonussum
+                       - added grades distribution
+                       - `translations' got \LoadDictionary and \LoadDictionaryFor
+                         added and loads of languages defined.
+2012/10/05 v0.2a       - resolved bug in saving and recovering question number
+                         using \exsheets@save@number and \QuestionNumber
+2012/10/08 v0.2b       - improved the reference to chapter/solution numbers
+                         in \printsolutions
+                       - resolved bug in \printsolutions introduced in the last
+                         update
+                       - upload to CTAN
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% TODO:
+- points/decimal-marker, points/frac (?), points/format (?,im interface)
\ No newline at end of file
diff --git a/Master/texmf-dist/tex/latex/exsheets/exsheets_configurations.cfg b/Master/texmf-dist/tex/latex/exsheets/exsheets_configurations.cfg
new file mode 100644
index 00000000000..3c64153c7ca
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/exsheets/exsheets_configurations.cfg
@@ -0,0 +1,5 @@
+\ProvidesFile{exsheets_configurations.cfg}
+
+% Put your definitions and configurations here.
+
+\endinput
\ No newline at end of file
diff --git a/Master/texmf-dist/tex/latex/exsheets/exsheets_headings.cfg b/Master/texmf-dist/tex/latex/exsheets/exsheets_headings.cfg
new file mode 100644
index 00000000000..3ec2ae06bf5
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/exsheets/exsheets_headings.cfg
@@ -0,0 +1,302 @@
+% --------------------------------------------------------------------------
+% the EXSHEETS package
+% 
+%   Yet another package for the creation of exercise sheets
+% 
+% --------------------------------------------------------------------------
+% Clemens Niederberger
+% Web:    https://bitbucket.org/cgnieder/exsheets/
+% E-Mail: contact@mychemistry.eu
+% --------------------------------------------------------------------------
+% Copyright 2011-2012 Clemens Niederberger
+% 
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+% 
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Clemens Niederberger.
+% --------------------------------------------------------------------------
+% The exsheets package consists of the files
+%  - exsheets.sty, exsheets_headings.def, exsheets_headings.cfg,
+%    exsheets_tasks.def, exsheets_tasks.cfg, exsheets_configurations.cfg,
+%  - exsheets_en.tex, exsheets_en.pdf,
+%  - README
+% --------------------------------------------------------------------------
+% If you have any ideas, questions, suggestions or bugs to report, please
+% feel free to contact me.
+% --------------------------------------------------------------------------
+% HEADINGS FOR QUESTIONS AND SOLUTIONS
+\ProvidesFile{exsheets_headings.cfg}
+  [\exsheets@date\space v\exsheets@version\space ExSheets headings instances]
+
+% SIMPLE:
+\DeclareInstance { exsheets-heading } { simple } { default }
+  {
+    title-format     = \normalsize ,
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    attach           = { main[l,t] number[l,t] (0pt,0pt) } ,
+    join             =
+      {
+        number[r,b] title[l,b] (1ex,0pt) ;
+        main[l,b] points[l,t] (1em,0pt)
+      }
+  }
+
+% BLOCK, REVERSED:
+\DeclareInstance { exsheets-heading } { block-rev } { default }
+  {
+    toc-reversed     = true ,
+    join             = { number[r,B] title[l,B] (1ex,0pt) } ,
+    attach           =
+      {
+        main[l,vc] number[l,vc] (0pt,0pt) ;
+        main[r,vc] points[l,vc] (\marginparsep,0pt)
+      }
+  }
+
+% BLOCK, POINTS WITH THE TITLE:
+\DeclareInstance { exsheets-heading } { block-wp } { default }
+  {
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             =
+      {
+        title[r,B] number[l,B] (1ex,0pt) ;
+        title[r,B] points[l,B] (1ex,0pt)
+      } ,
+    attach           = { main[l,vc] title[l,vc] (0pt,0pt) }
+  }
+
+% BLOCK, POINTS WITH THE TITLE, REVERSED:
+\DeclareInstance { exsheets-heading } { block-wp-rev } { default }
+  {
+    toc-reversed     = true ,
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             =
+      {
+        number[r,B] title[l,B] (1ex,0pt) ;
+        number[r,B] points[l,B] (1ex,0pt)
+      } ,
+    attach           = { main[l,vc] number[l,vc] (0pt,0pt) }
+  }
+
+% BLOCK WITH NO TITLE:
+\DeclareInstance { exsheets-heading } { block-nr } { default }
+  {
+    attach           =
+      {
+        main[l,vc] number[l,vc] (0pt,0pt) ;
+        main[r,vc] points[l,vc] (\marginparsep,0pt)
+      }
+  }
+
+% BLOCK WITH NO TITLE, NUMBER WITH THE TITLE:
+\DeclareInstance { exsheets-heading } { block-nr-wp } { default }
+  {
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             = { number[r,vc] points[l,vc] (1ex,0pt) } ,
+    attach           = { main[l,vc] number[l,vc] (0pt,0pt) }
+  }
+
+% RUNIN, REVERSED:
+\DeclareInstance { exsheets-heading } { runin-rev } { default }
+  {
+    toc-reversed     = true ,
+    runin            = true ,
+    title-post-code  = \c_space_tl ,
+    attach           =
+      { main[l,vc] points[l,vc] (\linewidth + \marginparsep,0pt) } ,
+    join             =
+      {
+        main[r,vc] number[r,vc] (0pt,0pt) ;
+        main[r,vc] title[l,vc] (1ex,0pt)
+      }
+  }
+
+% RUNIN, POINTS WITH THE TITLE:
+\DeclareInstance { exsheets-heading } { runin-wp } { default }
+  {
+    runin            = true ,
+    points-pre-code  = ( ,
+    points-post-code = ) \c_space_tl ,
+    join             =
+      {
+        main[r,vc] title[r,vc] (0pt,0pt) ;
+        main[r,vc] number[l,vc] (1ex,0pt) ;
+        main[r,vc] points[l,vc] (1ex,0pt)
+      }
+  }
+
+% RUNIN, POINTS WITH THE TITLE, REVERSED:
+\DeclareInstance { exsheets-heading } { runin-wp-rev } { default }
+  {
+    toc-reversed     = true ,
+    runin            = true ,
+    points-pre-code  = ( ,
+    points-post-code = ) \c_space_tl ,
+    join             =
+      {
+        main[r,vc] number[r,vc] (0pt,0pt) ;
+        main[r,vc] title[l,vc] (1ex,0pt) ;
+        main[r,vc] points[l,vc] (1ex,0pt)
+      }
+  }
+
+% RUNIN WITH NO TITLE:
+\DeclareInstance { exsheets-heading } { runin-nr } { default }
+  {
+    runin            = true ,
+    number-post-code = \c_space_tl ,
+    attach           =
+      { main[l,vc] points[l,vc] (\linewidth + \marginparsep,0pt) } ,
+    join             = { main[r,vc] number[l,vc] (0pt,0pt) }
+  }
+
+% RUNIN WITH NO TITLE, POINTS WITH THE TITLE:
+\DeclareInstance { exsheets-heading } { runin-nr-wp } { default }
+  {
+    runin            = true ,
+    points-pre-code  = ( ,
+    points-post-code = ) \c_space_tl ,
+    join             =
+      {
+        main[r,vc] number[l,vc] (0pt,0pt) ;
+        main[r,vc] points[l,vc] (1ex,0pt)
+      }
+  }
+
+% RUNIN WITH NO TITLE, FIXED WIDTH OF NUMBER
+\DeclareInstance { exsheets-heading } { runin-fixed-nr } { default }
+  {
+    runin            = true ,
+    number-pre-code  = \hbox to 2em \bgroup ,
+    number-post-code = \hfil\egroup ,
+    attach           =
+      { main[l,vc]points[l,vc](\linewidth+\marginparsep,0pt) } ,
+    join             = { main[r,vc]number[l,vc](0pt,0pt) }
+  }
+
+% CENTERED:
+\DeclareInstance { exsheets-heading } { centered } { default }
+  {
+    join             = { title[r,B] number[l,B] (1ex,0pt) } ,
+    attach           =
+      {
+        main[hc,vc] title[hc,vc] (0pt,0pt) ;
+        main[r,vc] points[l,vc] (\marginparsep,0pt)
+      }
+  }
+
+% CENTERED, POINTS WITH THE TITLE:
+\DeclareInstance { exsheets-heading } { centered-wp } { default }
+  {
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             =
+      {
+        title[r,B] number[l,B] (1ex,0pt) ;
+        title[r,B] points[l,B] (1ex,0pt)
+      } ,
+    attach           = { main[hc,vc] title[hc,vc] (0pt,0pt) }
+  }
+
+% MARGIN:
+\DeclareInstance { exsheets-heading } { margin } { default }
+  {
+    runin            = true ,
+    number-post-code = \c_space_tl ,
+    points-pre-code  = ( ,
+    points-post-code = ) \c_space_tl ,
+    join             = { title[r,b] number[l,b] (1ex,0pt) } ,
+    attach           =
+      {
+        main[l,vc] title[r,vc] (0pt,0pt) ;
+        main[l,b] points[r,t] (0pt,0pt)
+      }
+  }
+
+% MARGIN WITH NO TITLE
+\DeclareInstance { exsheets-heading } { margin-nr } { default }
+  {
+    runin  = true ,
+    attach =
+      {
+        main[l,vc]number[r,vc](-1ex,0pt) ;
+        main[r,vc]points[l,vc](\linewidth+\marginparsep,0pt)
+      }
+  }
+
+% RIGHT-ALIGNED:
+\DeclareInstance { exsheets-heading } { raggedleft } { default }
+  {
+    join             = { title[r,B] number[l,B] (1ex,0pt) } ,
+    attach           =
+      {
+        main[r,vc] title[r,vc] (0pt,0pt) ;
+        main[r,vc] points[l,vc] (\marginparsep,0pt)
+      }
+  }
+
+% MIMICKING KOMA-SECTION:
+\DeclareInstance { exsheets-heading } { koma-section } { default }
+  {
+    vscale           = 2 ,
+    title-format     = \Large\bfseries\sffamily ,
+    join             = { title[r,B] number[l,B] (1ex,0pt) } ,
+    attach           =
+      {
+        main[l,vc] title[l,vc] (0pt,0pt) ;
+        main[r,vc] points[l,vc] (\marginparsep,0pt)
+      }
+  }
+
+% FANCY:
+\DeclareInstance { exsheets-heading } { fancy } { default }
+  {
+    toc-reversed     = true ,
+    indent-first     = true ,
+    vscale           = 2 ,
+    pre-code         = \rule{\linewidth}{1pt} ,
+    post-code        = \rule{\linewidth}{1pt} ,
+    title-format     = \large\scshape\color{exsheetsred} ,
+    number-format    = \large\bfseries\color{exsheetsblue} ,
+    points-format    = \itshape ,
+    join             = { number[r,B] title[l,B] (1ex,0pt) } ,
+    attach           =
+      {
+        main[hc,vc] number[hc,vc] (0pt,0pt) ;
+        main[l,vc] points[r,vc] (-\marginparsep,0pt)
+      }
+  }
+
+% FANCY, POINTS WITH THE TITLE:
+\DeclareInstance { exsheets-heading } { fancy-wp } { default }
+  {
+    toc-reversed     = true ,
+    indent-first     = true ,
+    vscale           = 2 ,
+    pre-code         = \rule{\linewidth}{1pt} ,
+    post-code        = \rule{\linewidth}{1pt} ,
+    title-format     = \large\scshape\color{exsheetsred} ,
+    number-format    = \large\bfseries\color{exsheetsblue} ,
+    points-format    = \itshape ,
+    points-pre-code  = ( ,
+    points-post-code = ) ,
+    join             =
+      {
+        number[r,B] title[l,B] (1ex,0pt) ;
+        number[r,B] points[l,B] (1ex,0pt)
+      } ,
+    attach           = { main[hc,vc] number[hc,vc] (0pt,0pt) }
+  }
+
+\tex_endinput:D
\ No newline at end of file
diff --git a/Master/texmf-dist/tex/latex/exsheets/exsheets_headings.def b/Master/texmf-dist/tex/latex/exsheets/exsheets_headings.def
new file mode 100644
index 00000000000..c5e9eeebe4d
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/exsheets/exsheets_headings.def
@@ -0,0 +1,371 @@
+% --------------------------------------------------------------------------
+% the EXSHEETS package
+% 
+%   Yet another package for the creation of exercise sheets
+% 
+% --------------------------------------------------------------------------
+% Clemens Niederberger
+% Web:    https://bitbucket.org/cgnieder/exsheets/
+% E-Mail: contact@mychemistry.eu
+% --------------------------------------------------------------------------
+% Copyright 2011-2012 Clemens Niederberger
+% 
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+% 
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Clemens Niederberger.
+% --------------------------------------------------------------------------
+% The exsheets package consists of the files
+%  - exsheets.sty, exsheets_headings.def, exsheets_headings.cfg,
+%    exsheets_tasks.def, exsheets_tasks.cfg, exsheets_configurations.cfg,
+%  - exsheets_en.tex, exsheets_en.pdf,
+%  - README
+% --------------------------------------------------------------------------
+% If you have any ideas, questions, suggestions or bugs to report, please
+% feel free to contact me.
+% --------------------------------------------------------------------------
+% HEADINGS FOR QUESTIONS AND SOLUTIONS
+% the 6 base coffins:
+\ProvidesFile{exsheets_headings.def}
+  [\exsheets@date\space v\exsheets@version\space ExSheets headings object]
+
+\coffin_new:N \l__exsheets_heading_main_coffin
+\coffin_new:N \l__exsheets_heading_pre_coffin
+\coffin_new:N \l__exsheets_heading_post_coffin
+\coffin_new:N \l__exsheets_heading_title_coffin
+\coffin_new:N \l__exsheets_heading_number_coffin
+\coffin_new:N \l__exsheets_heading_points_coffin
+
+% the object varaibles:
+\bool_new:N   \l__exsheets_heading_runin_bool
+\bool_new:N   \l__exsheets_heading_indent_first_bool
+\bool_new:N   \l__exsheets_heading_toc_reversed_bool
+
+\dim_new:N    \l__exsheets_heading_above_dim
+\dim_new:N    \l__exsheets_heading_below_dim
+\fp_new:N     \l__exsheets_heading_scale_fp
+
+\tl_new:N     \l__exsheets_heading_main_tl
+\tl_new:N     \l__exsheets_heading_pre_code_tl
+\tl_new:N     \l__exsheets_heading_post_code_tl
+
+\tl_new:N     \l__exsheets_heading_title_format_tl
+\tl_new:N     \l__exsheets_heading_title_pre_code_tl
+\tl_new:N     \l__exsheets_heading_title_post_code_tl
+
+\tl_new:N     \l__exsheets_heading_number_format_tl
+\tl_new:N     \l__exsheets_heading_number_pre_code_tl
+\tl_new:N     \l__exsheets_heading_number_post_code_tl
+
+\tl_new:N     \l__exsheets_heading_points_format_tl
+\tl_new:N     \l__exsheets_heading_points_pre_code_tl
+\tl_new:N     \l__exsheets_heading_points_post_code_tl
+
+\tl_new:N     \l__exsheets_heading_joined_coffins_tl
+\tl_new:N     \l__exsheets_heading_attached_coffins_tl
+\seq_new:N    \l__exsheets_heading_joined_coffins_seq
+\seq_new:N    \l__exsheets_heading_attached_coffins_seq
+
+% internal object functions:
+% the following is shamelessly adapted from the `needspace' package by
+% Peter Wilson and Herries Press
+\cs_new:Npn \exsheets_needspace:n #1
+  {
+    \group_begin:
+      \dim_set:Nn \l__exsheets_tmpa_dim { #1 }
+      \skip_vertical:n { \c_zero_dim + \l__exsheets_tmpa_dim }
+      \tex_penalty:D -100
+      \skip_vertical:n { \c_zero_dim - \l__exsheets_tmpa_dim }
+      \skip_vertical:N \l__exsheets_tmpa_dim
+      \tex_penalty:D 9999
+      \skip_vertical:n { - \l__exsheets_tmpa_dim }
+      \skip_vertical:N \c_zero_dim
+    \group_end:
+  }
+
+\AtBeginDocument
+  {
+    \cs_if_exist:NF \needspace
+      { \cs_set_eq:NN \needspace \exsheets_needspace:n }
+  }
+
+\cs_generate_variant:Nn \seq_set_split:Nnn { NnV }
+
+\cs_new:Npn \__exsheets_join:N #1
+  {
+    \seq_map_inline:Nn #1
+      {
+        \tl_if_blank:nF { ##1 }
+          { \exp_after:wN \__exsheets_join_coffin_sequence:w ##1 }
+      }
+  }
+\cs_new:Npn \__exsheets_join_coffin_sequence:w #1[#2,#3] #4[#5,#6] (#7,#8)
+  { \__exsheets_join_coffins:nnnnnnnn {#1}{#2}{#3}{#4}{#5}{#6}{#7}{#8} }
+
+\cs_new:Npn \__exsheets_join_coffins:nnnnnnnn #1#2#3#4#5#6#7#8
+  {
+    \coffin_join:cnncnnnn
+      { l__exsheets_heading_#1_coffin } { #2 } { #3 }
+      { l__exsheets_heading_#4_coffin } { #5 } { #6 }
+      { #7 } { #8 }
+  }
+\cs_new:Npn \__exsheets_attach:N #1
+  {
+    \seq_map_inline:Nn #1
+      {
+        \tl_if_blank:nF { ##1 }
+          { \exp_after:wN \__exsheets_attach_coffin_sequence:w ##1 }
+      }
+  }
+\cs_new:Npn \__exsheets_attach_coffin_sequence:w #1[#2,#3]#4[#5,#6](#7,#8)
+  { \__exsheets_attach_coffins:nnnnnnnn {#1}{#2}{#3}{#4}{#5}{#6}{#7}{#8} }
+
+\cs_new:Npn \__exsheets_attach_coffins:nnnnnnnn #1#2#3#4#5#6#7#8
+  {
+    \coffin_attach:cnncnnnn
+      { l__exsheets_heading_#1_coffin } { #2 } { #3 }
+      { l__exsheets_heading_#4_coffin } { #5 } { #6 }
+      { #7 } { #8 }
+  }
+
+% the `exsheets-heading' object:
+%   #1 = title,
+%   #2 = number,
+%   #3 = points
+%   #4 = bonus
+\DeclareObjectType { exsheets-heading } { 4 }
+
+% the `default' template interface:
+\DeclareTemplateInterface { exsheets-heading } { default } { 4 }
+  {
+    runin            : boolean   = false ,
+    indent-first     : boolean   = false ,
+    toc-reversed     : boolean   = false ,
+    vscale           : real      = 1     ,
+    above            : length    = 2pt   ,
+    below            : length    = 2pt   ,
+    main             : tokenlist =       ,
+    pre-code         : tokenlist =       ,
+    post-code        : tokenlist =       ,
+    title-format     : tokenlist =       ,
+    title-pre-code   : tokenlist =       ,
+    title-post-code  : tokenlist =       ,
+    number-format    : tokenlist =       ,
+    number-pre-code  : tokenlist =       ,
+    number-post-code : tokenlist =       ,
+    points-format    : tokenlist =       ,
+    points-pre-code  : tokenlist =       ,
+    points-post-code : tokenlist =       ,
+    join             : tokenlist =       ,
+    attach           : tokenlist =
+  }
+
+% the `default' template code:
+\DeclareTemplateCode { exsheets-heading } { default } { 4 }
+  {
+    runin            = \l__exsheets_heading_runin_bool          ,
+    indent-first     = \l__exsheets_heading_indent_first_bool   ,
+    toc-reversed     = \l__exsheets_heading_toc_reversed_bool   ,
+    vscale           = \l__exsheets_heading_scale_fp            ,
+    above            = \l__exsheets_heading_above_dim           ,
+    below            = \l__exsheets_heading_below_dim           ,
+    main             = \l__exsheets_heading_main_tl             ,
+    pre-code         = \l__exsheets_heading_pre_code_tl         ,
+    post-code        = \l__exsheets_heading_post_code_tl        ,
+    title-format     = \l__exsheets_heading_title_format_tl     ,
+    title-pre-code   = \l__exsheets_heading_title_pre_code_tl   ,
+    title-post-code  = \l__exsheets_heading_title_post_code_tl  ,
+    number-format    = \l__exsheets_heading_number_format_tl    ,
+    number-pre-code  = \l__exsheets_heading_number_pre_code_tl  ,
+    number-post-code = \l__exsheets_heading_number_post_code_tl ,
+    points-format    = \l__exsheets_heading_points_format_tl    ,
+    points-pre-code  = \l__exsheets_heading_points_pre_code_tl  ,
+    points-post-code = \l__exsheets_heading_points_post_code_tl ,
+    join             = \l__exsheets_heading_joined_coffins_tl   ,
+    attach           = \l__exsheets_heading_attached_coffins_tl
+  }
+  {
+    \AssignTemplateKeys
+    \bool_if:nT
+      { \l__exsheets_questions_totoc_bool && \l__exsheets_inside_question_bool }
+      {
+        \phantomsection
+        \addcontentsline { toc } { \l__exsheets_questions_toclevel_tl }
+          {
+            \bool_if:NTF \l__exsheets_heading_toc_reversed_bool
+              { #2 \ #1 }
+              { #1\ #2 }
+          }
+      }
+    \bool_if:nT
+      { \l__exsheets_solutions_totoc_bool && !\l__exsheets_inside_question_bool }
+      {
+        \phantomsection
+        \addcontentsline { toc } { \l__exsheets_solutions_toclevel_tl }
+          {
+            \bool_if:NTF \l__exsheets_heading_toc_reversed_bool
+              { #2 \ #1 }
+              { #1\ #2 }
+          }
+      }
+    \seq_set_split:NnV \l__exsheets_heading_joined_coffins_seq { ; }
+      \l__exsheets_heading_joined_coffins_tl
+    \seq_set_split:NnV \l__exsheets_heading_attached_coffins_seq { ; }
+      \l__exsheets_heading_attached_coffins_tl
+    \bool_if:NTF \l__exsheets_heading_runin_bool
+      {
+        \hcoffin_set:Nn \l__exsheets_heading_main_coffin
+          {
+            \tl_if_blank:VTF \l__exsheets_heading_main_tl
+              { \tl_use:N \l__exsheets_heading_title_format_tl \strut }
+              { \tl_use:N \l__exsheets_heading_main_tl }
+          }
+      }
+      {
+        \hcoffin_set:Nn \l__exsheets_heading_main_coffin
+          {
+            \parbox { \linewidth }
+              {
+                \tl_if_blank:VTF \l__exsheets_heading_main_tl
+                  { \tl_use:N \l__exsheets_heading_title_format_tl \strut }
+                  { \tl_use:N \l__exsheets_heading_main_tl }
+              }
+          }
+      }
+    \hcoffin_set:Nn \l__exsheets_heading_pre_coffin
+      { \tl_use:N \l__exsheets_heading_pre_code_tl }
+    \hcoffin_set:Nn \l__exsheets_heading_post_coffin
+      { \tl_use:N \l__exsheets_heading_post_code_tl }
+    \coffin_join:NnnNnnnn
+      \l__exsheets_heading_main_coffin { l } { t }
+      \l__exsheets_heading_pre_coffin { l } { b } { 0pt } { 0pt }
+    \coffin_join:NnnNnnnn
+      \l__exsheets_heading_main_coffin { l } { b }
+      \l__exsheets_heading_post_coffin { l } { t } { 0pt } { 0pt }
+    \hcoffin_set:Nn \l__exsheets_heading_title_coffin
+      {
+        \tl_use:N \l__exsheets_heading_title_format_tl
+        \strut
+        \exsheets_questions_debug:
+        \tl_use:N \l__exsheets_heading_title_pre_code_tl
+          { \tl_use:N \l__exsheets_heading_title_user_format_tl #1 }
+        \tl_use:N \l__exsheets_heading_title_post_code_tl
+      }
+    \hcoffin_set:Nn \l__exsheets_heading_number_coffin
+      {
+        \tl_if_blank:VTF \l__exsheets_heading_number_format_tl
+          { \tl_use:N \l__exsheets_heading_title_format_tl }
+          { \tl_use:N \l__exsheets_heading_number_format_tl }
+        \strut
+        \tl_use:N \l__exsheets_heading_number_pre_code_tl
+          { \tl_use:N \l__exsheets_heading_title_user_format_tl #2 }
+        \tl_use:N \l__exsheets_heading_number_post_code_tl
+      }
+    \hcoffin_set:Nn \l__exsheets_heading_points_coffin
+      {
+        \bool_if:nF { \fp_compare_p:n { #3 = 0 } && \fp_compare_p:n { #4 = 0 } }
+          {
+            \tl_use:N \l__exsheets_heading_points_format_tl
+            \group_begin:
+              \tl_use:N \l__exsheets_heading_title_format_tl \strut
+            \group_end:
+            \tl_use:N \l__exsheets_heading_points_pre_code_tl
+              {
+                % TODO: \l__exsheets_points_separate_bonus_bool beachten
+                \fp_compare:nF { #3 = 0 }
+                  {
+                    \bool_if:nTF
+                      {
+                        \l__exsheets_points_separate_bonus_bool ||
+                        \fp_compare_p:n { #4 = 0 }
+                      }
+                      { \exsheets_print_points:n { #3 } }
+                      { \exsheets_parse_points:n { #3 } }
+                  }
+                \bool_if:nT { !\fp_compare_p:n { #3 = 0 } && !\fp_compare_p:n { #4 = 0 } }
+                  { ~ }
+                \fp_compare:nF { #4 = 0 }
+                  {
+                    \tl_use:N \l__exsheets_points_pre_bonus_marker_tl
+                    \bool_if:nTF
+                      {
+                        \l__exsheets_points_separate_bonus_bool ||
+                        \fp_compare_p:n { #3 = 0 }
+                      }
+                      {
+                        \exsheets_print_bonus:n { #4 }
+                        \tl_use:N \l__exsheets_points_post_bonus_marker_tl
+                      }
+                      {
+                        \exsheets_parse_bonus:n { #4 }
+                        \tl_use:N \l__exsheets_points_post_bonus_marker_tl
+                        \exsheets_points_name:n { #3 + #4 }
+                      }
+                  }
+              }
+            \tl_use:N \l__exsheets_heading_points_post_code_tl
+          }
+      }
+    \bool_if:NF \l__exsheets_heading_runin_bool
+      {
+         \coffin_resize:Nnn \l__exsheets_heading_main_coffin { \linewidth }
+          {
+            \fp_to_decimal:N \l__exsheets_heading_scale_fp
+            \coffin_ht:N \l__exsheets_heading_main_coffin +
+            \l__exsheets_heading_below_dim
+          }
+      }
+    \__exsheets_join:N \l__exsheets_heading_joined_coffins_seq
+    \__exsheets_attach:N \l__exsheets_heading_attached_coffins_seq
+    \skip_vertical:N \l__exsheets_heading_above_dim
+    \exsheets_needspace:n
+      {
+        \coffin_ht:N \l__exsheets_heading_main_coffin +
+        \coffin_dp:N \l__exsheets_heading_main_coffin +
+        \l__exsheets_heading_below_dim +
+        \baselineskip
+      }
+    \noindent
+    \coffin_typeset:Nnnnn \l__exsheets_heading_main_coffin
+      { H } { l } { 0pt }{ 0pt }
+    \bool_if:NF \l__exsheets_heading_runin_bool
+      {
+        \skip_vertical:N \l__exsheets_heading_below_dim
+        \bool_if:NF \l__exsheets_heading_indent_first_bool { \noindent }
+      }
+  }
+
+% the two basic instances:
+% BLOCK:
+\DeclareInstance { exsheets-heading } { block } { default }
+  {
+    join             = { title[r,B] number[l,B] (1ex,0pt) } ,
+    attach           =
+      {
+        main[l,vc] title[l,vc] (0pt,0pt) ;
+        main[r,vc] points[l,vc] (\marginparsep,0pt)
+      }
+  }
+
+% RUNIN:
+\DeclareInstance { exsheets-heading } { runin } { default }
+  {
+    runin            = true ,
+    number-post-code = \c_space_tl ,
+    attach           =
+      { main[l,vc] points[l,vc] (\linewidth + \marginparsep,0pt) } ,
+    join             =
+      {
+        main[r,vc] title[r,vc] (0pt,0pt) ;
+        main[r,vc] number[l,vc] (1ex,0pt)
+      }
+  }
+
+\tex_endinput:D
\ No newline at end of file
diff --git a/Master/texmf-dist/tex/latex/exsheets/exsheets_tasks.cfg b/Master/texmf-dist/tex/latex/exsheets/exsheets_tasks.cfg
new file mode 100644
index 00000000000..54de030795b
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/exsheets/exsheets_tasks.cfg
@@ -0,0 +1,56 @@
+% --------------------------------------------------------------------------
+% the EXSHEETS package
+% 
+%   Yet another package for the creation of exercise sheets
+% 
+% --------------------------------------------------------------------------
+% Clemens Niederberger
+% Web:    https://bitbucket.org/cgnieder/exsheets/
+% E-Mail: contact@mychemistry.eu
+% --------------------------------------------------------------------------
+% Copyright 2011-2012 Clemens Niederberger
+% 
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+% 
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Clemens Niederberger.
+% --------------------------------------------------------------------------
+% The exsheets package consists of the files
+%  - exsheets.sty, exsheets_headings.def, exsheets_headings.cfg,
+%    exsheets_tasks.def, exsheets_tasks.cfg, exsheets_configurations.cfg,
+%  - exsheets_en.tex, exsheets_en.pdf,
+%  - README
+% --------------------------------------------------------------------------
+% If you have any ideas, questions, suggestions or bugs to report, please
+% feel free to contact me.
+% --------------------------------------------------------------------------
+% further instances for the `tasks' environment
+\ProvidesFile{exsheets_tasks.cfg}
+  [\exsheets@date\space v\exsheets@version\space ExSheets tasks instances]
+
+% ITEMIZE:
+\DeclareInstance { exsheets-tasks } { itemize } { default }
+  {
+    enumerate    = false ,
+    label-width  = 2.25ex
+  }
+
+% ENUMERATE:
+\DeclareInstance { exsheets-tasks } { enumerate } { default }
+  { label-format = tsk. }
+
+% MULTIPLECHOICE
+\DeclareInstance { exsheets-tasks } { multiplechoice } { default }
+  {
+    enumerate    = false       ,
+    label        = \choicebox
+  }
+
+\tex_endinput:D
\ No newline at end of file
diff --git a/Master/texmf-dist/tex/latex/exsheets/exsheets_tasks.def b/Master/texmf-dist/tex/latex/exsheets/exsheets_tasks.def
new file mode 100644
index 00000000000..8ff8c581753
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/exsheets/exsheets_tasks.def
@@ -0,0 +1,334 @@
+% --------------------------------------------------------------------------
+% the EXSHEETS package
+% 
+%   Yet another package for the creation of exercise sheets
+% 
+% --------------------------------------------------------------------------
+% Clemens Niederberger
+% Web:    https://bitbucket.org/cgnieder/exsheets/
+% E-Mail: contact@mychemistry.eu
+% --------------------------------------------------------------------------
+% Copyright 2011-2012 Clemens Niederberger
+% 
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+% 
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Clemens Niederberger.
+% --------------------------------------------------------------------------
+% The exsheets package consists of the files
+%  - exsheets.sty, exsheets_headings.def, exsheets_headings.cfg,
+%    exsheets_tasks.def, exsheets_tasks.cfg, exsheets_configurations.cfg,
+%  - exsheets_en.tex, exsheets_en.pdf,
+%  - README
+% --------------------------------------------------------------------------
+% If you have any ideas, questions, suggestions or bugs to report, please
+% feel free to contact me.
+% --------------------------------------------------------------------------
+% TASKS: LIST-LIKE ENVIRONMENT
+\ProvidesFile{exsheets_tasks.def}
+  [\exsheets@date\space v\exsheets@version\space ExSheets tasks object]
+
+\RequirePackage { epic }
+
+% variables:
+\seq_new:N    \l__exsheets_tasks_seq
+\int_new:N    \l__exsheets_tasks_depth_int
+\int_new:N    \l__exsheets_tasks_int
+\int_new:N    \l__exsheets_tasks_total_items_int
+\int_new:N    \l__exsheets_tasks_columns_int
+\int_new:N    \l__exsheets_tasks_rows_int
+\bool_new:N   \l__exsheets_tasks_enumerate_bool
+\tl_new:N     \l__exsheets_tasks_instance_tl
+\tl_new:N     \l__exsheets_tasks_label_tl
+\tl_new:N     \l__exsheets_tasks_label_pattern_tl
+\tl_new:N     \l__exsheets_tasks_custom_label_format_tl
+\dim_new:N    \l__exsheets_tasks_item_indent_dim
+\dim_new:N    \l__exsheets_tasks_after_item_skip_dim
+\dim_new:N    \l__exsheets_tasks_item_width_dim
+\dim_new:N    \l__exsheets_tasks_label_width_dim
+\dim_new:N    \l__exsheets_tasks_default_label_width_dim
+\skip_new:N   \l__exsheets_tasks_before_list_skip
+\skip_set:Nn  \l__exsheets_tasks_before_list_skip { .33\baselineskip }
+\skip_new:N   \l__exsheets_tasks_after_list_skip
+\skip_new:N   \l__exsheets_tasks_after_list_default_skip
+\skip_set:Nn  \l__exsheets_tasks_after_list_default_skip { .33\baselineskip }
+
+\NewCounterPattern* [ exsheets ] { task } { tsk }
+\ReadCounterFrom [ exsheets ] { task } \l__exsheets_tasks_int
+
+% scratch coffins:
+\cs_if_exist:NF \l__exsheets_tmpa_coffin { \coffin_new:N \l__exsheets_tmpa_coffin }
+\cs_if_exist:NF \l__exsheets_tmpb_coffin { \coffin_new:N \l__exsheets_tmpb_coffin }
+\cs_if_exist:NF \l__exsheets_tmpc_coffin { \coffin_new:N \l__exsheets_tmpc_coffin }
+
+% collect the tasks:
+%  #1: instance
+%  #2: number of columns
+%  #3: environment body
+\cs_new:Npn \__exsheets_tasks:nnw #1#2#3 \end
+  {
+    \par \addvspace { \l__exsheets_tasks_before_list_skip }
+    \seq_set_split:Nnn \l__exsheets_tasks_seq { ; } { #3 }
+    % remove the last (empty) item:
+    \seq_pop_right:NN \l__exsheets_tasks_seq \l__exsheets_tmpa_tl
+    \tl_if_blank:VF \l__exsheets_tmpa_tl
+      { % TODO ERROR
+      }
+    \int_set:Nn \l__exsheets_tasks_total_items_int
+      { \seq_length:N \l__exsheets_tasks_seq }
+    \UseInstance { exsheets-tasks } { #1 }
+      { \l__exsheets_tasks_total_items_int }
+      { #2 }
+      { \l__exsheets_tasks_custom_label_format_tl }
+    % just to be sure:
+    \seq_clear:N \l__exsheets_tasks_seq
+    \par \skip_vertical:N \l__exsheets_tasks_after_list_skip
+    % we gobbled this from the input stream, let's put it back:
+    \end
+  }
+\cs_generate_variant:Nn \__exsheets_tasks:nnw { V }
+
+\cs_new:Npn \__exsheets_task:nnw #1#2[#3,#4][#5,#6](#7,#8)
+  {
+    \dim_set:Nn \l__exsheets_tasks_item_width_dim
+      {
+        \linewidth / \l__exsheets_tasks_columns_int -
+        \l__exsheets_tasks_depth_int\l__exsheets_tasks_item_indent_dim
+      }
+    \int_incr:N \l__exsheets_tmpa_int
+    \__exsheets_tasks_set_rows_num:NN
+      \l__exsheets_tasks_total_items_int
+      \l__exsheets_tasks_columns_int
+    \int_compare:nT { \l__exsheets_tmpa_int > \l__exsheets_tasks_columns_int }
+      { \int_set:Nn \l__exsheets_tmpa_int { 1 } }
+    % the item:
+    \hcoffin_set:Nn \l__exsheets_tmpa_coffin
+      {
+        \vcoffin_set:Nnn \l__exsheets_tmpc_coffin
+          { \l__exsheets_tasks_item_width_dim }
+          { \__exsheets_tasks_setup: #2 }
+        \coffin_typeset:Nnnnn \l__exsheets_tmpc_coffin
+          { l } { b } { 0pt } { 0pt }
+      }
+    % the label:
+    \hcoffin_set:Nn \l__exsheets_tmpb_coffin { \strut #1 }
+    \coffin_attach:NnnNnnnn
+      \l__exsheets_tmpa_coffin { l } { t }
+      \l__exsheets_tmpb_coffin { l } { t } { -\l__exsheets_tasks_label_width_dim } { 0pt }
+    % typeset label & item:
+    % need this when a new row starts:
+    \int_compare:nT { \l__exsheets_tmpa_int = 1 } { \par\noindent }
+    \skip_horizontal:N \l__exsheets_tasks_item_indent_dim
+    \coffin_typeset:Nnnnn \l__exsheets_tmpa_coffin { l } { T } { 0pt } { 0pt }
+    % need this before a new row starts:
+    \int_compare:nT { \l__exsheets_tmpa_int = \l__exsheets_tasks_columns_int }
+      { \skip_vertical:N \l__exsheets_tasks_after_item_skip_dim }
+    \coffin_clear:N \l__exsheets_tmpa_coffin
+    \coffin_clear:N \l__exsheets_tmpb_coffin
+    \coffin_clear:N \l__exsheets_tmpc_coffin
+  }
+\cs_generate_variant:Nn \__exsheets_task:nnw { VV }
+
+\cs_new:Npn \__exsheets_tasks_setup:
+  {
+    \dim_set:Nn \parskip { 0pt }
+    \noindent
+    \dim_set_eq:NN \parskip \parsep
+    \dim_set_eq:NN \parindent \listparindent
+    \strut
+  }
+
+\cs_new:Npn \__exsheets_tasks_set_rows_num:NN #1#2
+  {
+    \int_set:Nn \l__exsheets_tasks_rows_int { \int_div_truncate:nn { #1 } { #2 } }
+    \int_compare:nNnT { \int_mod:nn { #1 } { #2 } } > { 0 }
+      { \int_incr:N \l__exsheets_tasks_rows_int }
+  }
+
+% the `exsheets-tasks' object:
+%   #1: number of items
+%   #2: number of columns
+%   #3: label-format
+\DeclareObjectType { exsheets-tasks } { 3 }
+% the `default' template interface:
+\DeclareTemplateInterface { exsheets-tasks } { default } { 3 }
+  {
+    enumerate       : boolean   = true    ,
+    label           : tokenlist           ,
+    indent          : length    = 2.5em   ,
+    label-format    : tokenlist = tsk[a]) ,
+    label-width     : length    = 3ex     ,
+    after-item-skip : length    = 2ex
+  }
+% the `default' template code:
+\DeclareTemplateCode { exsheets-tasks } { default } { 3 }
+  {
+    enumerate       = \l__exsheets_tasks_enumerate_bool          ,
+    label           = \l__exsheets_tasks_label_tl                ,
+    indent          = \l__exsheets_tasks_item_indent_dim         ,
+    label-format    = \l__exsheets_tasks_label_pattern_tl         ,
+    label-width     = \l__exsheets_tasks_default_label_width_dim ,
+    after-item-skip = \l__exsheets_tasks_after_item_skip_dim
+  }
+  {
+    \AssignTemplateKeys
+    \skip_set:Nn  \l__exsheets_tasks_after_list_skip
+      {
+        \l__exsheets_tasks_after_list_default_skip -
+        \l__exsheets_tasks_after_item_skip_dim
+      }
+    \dim_compare:nT { \l__exsheets_tasks_label_width_dim = 0pt }
+      {
+        \dim_set_eq:NN
+          \l__exsheets_tasks_label_width_dim
+          \l__exsheets_tasks_default_label_width_dim
+      }
+    % need this for enumerate list:
+    \int_zero:N \l__exsheets_tasks_int
+    \int_set:Nn \l__exsheets_tasks_columns_int { #2 }
+    % set all the items in their own coffins and join with the ground:
+    \int_zero:N \l__exsheets_tmpa_int
+    \tl_if_blank:VF \l__exsheets_tasks_custom_label_format_tl
+      {
+        \tl_set_eq:NN
+          \l__exsheets_tasks_label_pattern_tl
+          \l__exsheets_tasks_custom_label_format_tl
+      }
+    \seq_map_inline:Nn \l__exsheets_tasks_seq
+      {
+        \__exsheets_read_item:w ##1\task{}{}\q_stop
+        \bool_if:NTF \l__exsheets_tasks_enumerate_bool
+          {
+            \int_incr:N \l__exsheets_tasks_int
+            \tl_if_blank:VT \l__exsheets_tasks_label_tl
+              {
+                \tl_set:Nn \l__exsheets_tasks_label_tl
+                  {
+                    \ReadCounterPatternFrom [ exsheets ]
+                      \l__exsheets_tasks_label_pattern_tl
+                  }
+              }
+          }
+          {
+            \tl_if_blank:VT \l__exsheets_tasks_label_tl
+              { \tl_set_eq:NN \l__exsheets_tasks_label_tl \labelitemi }
+          }
+        \tl_if_blank:VTF \l__exsheets_tasks_tmp_label_tl
+          {
+            \__exsheets_task:VVw
+              \l__exsheets_tasks_label_tl
+              \l__exsheets_tasks_item_tl
+              [ l , b ] [ l , t ] ( 0pt , 0pt )
+          }
+          {
+            \__exsheets_task:VVw
+              \l__exsheets_tasks_tmp_label_tl
+              \l__exsheets_tasks_item_tl
+              [ l , b ] [ l , t ] ( 0pt , 0pt )
+            \tl_clear:N \l__exsheets_tasks_tmp_label_tl
+          }
+      }
+  }
+
+\tl_new:N \task
+\tl_new:N \l__exsheets_tasks_item_tl
+\tl_new:N \l__exsheets_tasks_tmp_label_tl
+
+\cs_new:Npn \__exsheets_read_item:w #1 \task #2#3 \q_stop
+  {
+    \tl_set:Nn \l__exsheets_tmpa_tl { #1 }
+    \tl_set:Nn \l__exsheets_tmpb_tl { #2 }
+    \tl_set:Nn \l__exsheets_tmpc_tl { #3 }
+    \tl_if_blank:VTF \l__exsheets_tmpa_tl
+      {
+        \tl_set_eq:NN \l__exsheets_tasks_item_tl \l__exsheets_tmpc_tl
+        \tl_set_eq:NN \l__exsheets_tasks_tmp_label_tl \l__exsheets_tmpb_tl
+      }
+      { \tl_set_eq:NN \l__exsheets_tasks_item_tl \l__exsheets_tmpa_tl }
+  }
+
+% choice box:
+\bool_new:N \l__exsheets_choice_checked_bool
+\dim_new:N  \l__exsheets_choice_width_dim
+\dim_set:Nn \l__exsheets_choice_width_dim { 1.25ex }
+\dim_new:N  \l__exsheets_choice_linewidth_dim
+\dim_set:Nn \l__exsheets_choice_linewidth_dim { .3pt }
+\dim_new:N  \l__exsheets_choice_checkwidth_dim
+\dim_set:Nn \l__exsheets_choice_checkwidth_dim { .5pt }
+\dim_new:N  \l__exsheets_choice_raise_dim
+\dim_set:Nn \l__exsheets_choice_raise_dim { .1ex }
+
+\cs_new:Npn \exsheets_choice:
+  {
+    \leavevmode
+    \bool_set_false:N \l__exsheets_choice_checked_bool
+    \box_move_up:nn
+      { \l__exsheets_choice_raise_dim }
+      { \hbox:n { \__exsheets_choice: } }
+  }
+
+\cs_new:Npn \exsheets_choice_checked:
+  {
+    \leavevmode
+    \bool_set_true:N \l__exsheets_choice_checked_bool
+    \box_move_up:nn
+      { \l__exsheets_choice_raise_dim }
+      { \hbox:n { \__exsheets_choice: } }
+  }
+
+\cs_new:Npn \__exsheets_choice:
+  {%
+    \dim_set:Nn \unitlength { .1\l__exsheets_choice_width_dim }
+    \begin{picture}(10,0)
+      \linethickness \l__exsheets_choice_linewidth_dim
+      \drawline(0,0)(0,10)(10,10)(10,0)(0,0)
+      \linethickness \l__exsheets_choice_checkwidth_dim
+      \bool_if:NT \l__exsheets_choice_checked_bool
+        {
+          \drawline(2,2)(8,8)
+          \drawline(2,8)(8,2)
+        }
+    \end{picture}%
+  }
+
+\cs_if_exist:NF \choicebox
+  { \cs_new:Npn \choicebox { \exsheets_choice: } }
+\cs_if_exist:NF \ckeckedchoicebox
+  { \cs_new:Npn \ckeckedchoicebox { \exsheets_choice_checked: } }
+
+% base instance:
+% ALPHABETIZE: a) b) c)
+\DeclareInstance { exsheets-tasks } { alphabetize } { default } { }
+
+\keys_define:nn { exsheets / tasks }
+  {
+    style       .tl_set:N   = \l__exsheets_tasks_instance_tl ,
+    label       .tl_set:N   = \l__exsheets_tasks_custom_label_format_tl ,
+    label-width .dim_set:N  = \l__exsheets_tasks_label_width_dim ,
+    before-skip .skip_set:N = \l__exsheets_tasks_before_list_skip ,
+    after-skip  .skip_set:N = \l__exsheets_tasks_after_list_skip
+  }
+
+% the user environment:
+\NewDocumentEnvironment { tasks } { oG{1} }
+  {
+    \IfNoValueTF { #1 }
+      { \keys_set:nn { exsheets / tasks } { style = alphabetize } }
+      {
+        \keys_set:nn { exsheets / tasks } { #1 }
+        \tl_if_blank:VT \l__exsheets_tasks_instance_tl
+          { \keys_set:nn { exsheets / tasks } { style = alphabetize } }
+      }
+    \int_incr:N \l__exsheets_tasks_depth_int
+    \__exsheets_tasks:Vnw \l__exsheets_tasks_instance_tl { #2 }
+  }
+  {  }
+
+\tex_endinput:D
\ No newline at end of file
diff --git a/Master/texmf-dist/tex/latex/exsheets/translations.sty b/Master/texmf-dist/tex/latex/exsheets/translations.sty
new file mode 100644
index 00000000000..208bc7295c1
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/exsheets/translations.sty
@@ -0,0 +1,311 @@
+% --------------------------------------------------------------------------
+% the TRANSLATIONS package
+% 
+%   a simple translator
+%
+% This package is part of the exsheets bundle
+% --------------------------------------------------------------------------
+% Clemens Niederberger
+% Web:    https://bitbucket.org/cgnieder/exsheets/
+% E-Mail: contact@mychemistry.eu
+% --------------------------------------------------------------------------
+% Copyright 2012 Clemens Niederberger
+% 
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+% 
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Clemens Niederberger.
+% --------------------------------------------------------------------------
+% The translations package consists of the files
+%  - translations.sty
+% --------------------------------------------------------------------------
+% If you have any ideas, questions, suggestions or bugs to report, please
+% feel free to contact me.
+% --------------------------------------------------------------------------
+\def\@trnslt@date{2012/10/08}
+\def\@trnslt@version{v0.2b}
+
+\ProvidesPackage{translations}[\@trnslt@date\space \@trnslt@version\space a simple translator]
+\RequirePackage{etoolbox}
+
+% --------------------------------------------------------------------------
+% message handling
+\def\@trnslt@error@message{%
+  For details have a look at the `exsheets' manual.}
+
+\def\@trnslt@create@message#1{%
+  \ifstrequal{#1}{Error}
+    {%
+      \lowercase{\csdef{@trnslt@#1}}##1{%
+        \csuse{Package#1}{translations}{##1}{\@trnslt@error@message}}%
+    }{%
+      \lowercase{\csdef{@trnslt@#1}}##1{%
+        \csuse{Package#1}{translations}{##1}}%
+    }}
+\@trnslt@create@message{Error}
+\@trnslt@create@message{Warning}
+\@trnslt@create@message{WarningNoLine}
+\@trnslt@create@message{Info}
+
+\def\@trnslt@err@unknown@lang#1{%
+  \@trnslt@error{Unknown language `#1'}}
+
+\def\@trnslt@warn@unknown@lang#1{%
+  \@trnslt@warning{Unknown language `#1'}}
+
+\def\@trnslt@err@already@defined#1#2{%
+  \@trnslt@error{The #2 translation for `#1' is already defined.}}
+
+\def\@trnslt@err@not@defined#1#2{%
+  \@trnslt@error{The \@trnslt@language{#2} translation for `#1' is not defined yet.}}
+
+% --------------------------------------------------------------------------
+% check if babel or polyglossia is used
+\AtEndPreamble{
+  \@ifpackageloaded{babel}{}{
+    \@ifpackageloaded{polyglossia}{}
+      {\@trnslt@warning{No language package found. I am going to use `english'
+        as default language.}}
+  }
+  \ifdef\languagename{}
+    {\def\languagename{english}}
+  \def\@trnslt@current@language{\languagename}
+  \ifdef\bbl@afterfi{}
+    {\long\def\bbl@afterfi#1\fi{\fi#1}}
+}
+
+% --------------------------------------------------------------------------
+% \DeclareLanguage and \DeclareLanguageAlias
+% #1: language
+\newrobustcmd*\DeclareLanguage[1]{%
+  \@trnslt@declare@language{#1}}
+\@onlypreamble\DeclareLanguage
+
+\def\@trnslt@declare@language#1{%
+  \csdef{@trnslt@language@#1}{#1}}
+
+% #1: alias
+% #2: language
+\newrobustcmd*\DeclareLanguageAlias[2]{%
+  \@trnslt@declare@languagealias{#1}{#2}}
+\@onlypreamble\DeclareLanguageAlias
+
+\def\@trnslt@declare@languagealias#1#2{%
+  \ifcsdef{@trnslt@language@#2}
+    {}{%
+      \@trnslt@warn@unknown@lang{#2}%
+      \@trnslt@declare@language{#2}%
+    }%
+  \csletcs{@trnslt@language@#1}{@trnslt@language@#2}}
+
+\def\@trnslt@language#1{%
+  \csuse{@trnslt@language@#1}}
+
+% --------------------------------------------------------------------------
+% \DeclareTranslation, \NewTranslation and \RenewTranslation
+% #1: language
+% #2: word
+% #3: replacement
+\newrobustcmd*\DeclareTranslation[3]{%
+  \@trnslt@declare@translation{#2}{#1}{#3}}
+\@onlypreamble\DeclareTranslation
+
+\def\@trnslt@declare@translation#1#2#3{%
+  \ifcsdef{@trnslt@language@#2}
+    {%
+      \csdef{@trnslt@word@#1@\@trnslt@language{#2}}{#3}%
+      \csdef{@trnslt@word@#1@literal}{#1}%
+    }
+    {\@trnslt@err@unknown@lang{#2}}}
+
+\def\@trnslt@if@translation#1#2{%
+  \ifcsdef{@trnslt@word@#1@\@trnslt@language{#2}}
+    {\expandafter\@firstoftwo}
+    {\expandafter\@secondoftwo}}
+
+\newrobustcmd*\NewTranslation[3]{%
+  \@trnslt@new@translation{#2}{#1}{#3}}
+\@onlypreamble\NewTranslation
+
+\def\@trnslt@new@translation#1#2#3{%
+  \@trnslt@if@translation{#1}{#2}
+    {\@trnslt@err@already@defined{#1}{#2}}
+    {\@trnslt@declare@translation{#1}{#2}{#3}}}
+
+\newrobustcmd*\RenewTranslation[3]{%
+  \@trnslt@renew@translation{#2}{#1}{#3}}
+\@onlypreamble\RenewTranslation
+
+\def\@trnslt@renew@translation#1#2#3{%
+  \@trnslt@if@translation{#1}{#2}
+    {\@trnslt@declare@translation{#1}{#2}{#3}}
+    {\@trnslt@err@not@defined{#1}{#2}}}
+
+% --------------------------------------------------------------------------
+% \GetTranslationFor and \GetTranslation
+% these need to be expandable!
+% #1: language
+% #2: word
+\newcommand*\GetTranslationFor[2]{%
+  \@trnslt@get@translation@for{#2}{#1}}
+
+\newcommand*\GetTranslation[1]{%
+  \@trnslt@get@translation@for{#1}{\@trnslt@current@language}}
+
+% #1: word #2: language
+\def\@trnslt@get@translation@for#1#2{%
+  \@trnslt@if@translation{#1}{#2}
+    {\csuse{@trnslt@word@#1@\@trnslt@language{#2}}}
+    {%
+      \@trnslt@warning{Translation for `#1' in #2 unknown.}%
+      \csuse{@trnslt@word@#1@literal}%
+    }}
+
+% --------------------------------------------------------------------------
+% \SaveTranslationFor and \SaveTranslation
+\newrobustcmd*\SaveTranslationFor[3]{%
+  \@trnslt@save@translation@for{#1}{#3}{#2}}
+
+\newrobustcmd*\SaveTranslation[2]{%
+  \@trnslt@save@translation@for{#1}{#2}{\@trnslt@current@language}}
+
+\def\@trnslt@save@translation@for#1#2#3{%
+  \edef#1{%
+    \@trnslt@if@translation{#2}{#3}
+      {\csuse{@trnslt@word@#2@\@trnslt@language{#3}}}
+      {}%
+  }}
+
+% --------------------------------------------------------------------------
+% \LoadDictionary and \LoadDictionaryFor
+\newrobustcmd*\LoadDictionary[1]{%
+  \@trnslt@load@dictionary@for{#1}{\@trnslt@current@language}}
+\@onlypreamble\LoadDictionary
+
+\newrobustcmd*\LoadDictionaryFor[2]{%
+  \@trnslt@load@dictionary@for{#1}{#2}}
+\@onlypreamble\LoadDictionaryFor
+
+\def\@trnslt@load@dictionary@for#1#2{%
+  \AtBeginDocument{%
+    \InputIfFileExists{#1-\@trnslt@language{#2}.trsl}
+      {\@trnslt@info{loading dictionary `#1' for `#2'.}}
+      {\@trnslt@warning{File `#1-\@trnslt@language{#2}.trsl' not found.}}%
+  }}
+
+\newrobustcmd*\ProvideDictionaryFor[2]{%
+  \@trnslt@provide@dictionary@for{#1}{#2}}
+\@onlypreamble\ProvideDictionaryFor
+
+\def\@trnslt@provide@dictionary@for#1#2{%
+  \def\@trnslt@dictionary@name{#2}%
+  \def\@trnslt@dictionary@lang{#1}%
+  \@ifnextchar[
+    {\@trnslt@provide@dictionary@version}
+    {\ProvidesFile{#2-#1.trsl}[(#1 translation file `#2')]}}
+
+\def\@trnslt@provide@dictionary@version[#1]{%
+  \ProvidesFile
+    {\@trnslt@dictionary@name-\@trnslt@dictionary@lang.trsl}%
+    [(\@trnslt@dictionary@lang\space translation file `\@trnslt@dictionary@name') #1]}
+
+% --------------------------------------------------------------------------
+% predefined languages
+\DeclareLanguage{albanian}
+\DeclareLanguage{bulgarian}
+\DeclareLanguage{catalan}
+\DeclareLanguage{croatian}
+\DeclareLanguage{czech}
+\DeclareLanguage{danish}
+\DeclareLanguage{dutch}
+\DeclareLanguage{english}
+\DeclareLanguage{finnish}
+\DeclareLanguage{french}
+\DeclareLanguage{german}
+\DeclareLanguage{greek}
+\DeclareLanguage{hebrew}
+\DeclareLanguage{hungarian}
+\DeclareLanguage{icelandic}
+\DeclareLanguage{italian}
+\DeclareLanguage{norwegian}
+\DeclareLanguage{polish}
+\DeclareLanguage{portuges}
+\DeclareLanguage{romanian}
+\DeclareLanguage{russian}
+\DeclareLanguage{serbocroatian}
+\DeclareLanguage{slovak}
+\DeclareLanguage{slovenian}
+\DeclareLanguage{spanish}
+\DeclareLanguage{swedish}
+\DeclareLanguage{turkish}
+\DeclareLanguage{ukrainian}
+
+\DeclareLanguageAlias{Albanian}{albanian}
+\DeclareLanguageAlias{Bulgarian}{bulgarian}
+\DeclareLanguageAlias{Catalan}{catalan}
+\DeclareLanguageAlias{Croatian}{croatian}
+\DeclareLanguageAlias{Czech}{czech}
+\DeclareLanguageAlias{Danish}{danish}
+\DeclareLanguageAlias{Dutch}{dutch}
+\DeclareLanguageAlias{Finnish}{finnish}
+\DeclareLanguageAlias{francais}{french}
+\DeclareLanguageAlias{Francais}{francais}
+\DeclareLanguageAlias{canadien}{french}
+\DeclareLanguageAlias{Canadien}{canadien}
+\DeclareLanguageAlias{French}{french}
+\DeclareLanguageAlias{american}{english}
+\DeclareLanguageAlias{American}{american}
+\DeclareLanguageAlias{australian}{english}
+\DeclareLanguageAlias{Australian}{australian}
+\DeclareLanguageAlias{british}{english}
+\DeclareLanguageAlias{British}{british}
+\DeclareLanguageAlias{canadian}{english}
+\DeclareLanguageAlias{Canadian}{canadian}
+\DeclareLanguageAlias{English}{english}
+\DeclareLanguageAlias{UKenglish}{english}
+\DeclareLanguageAlias{USenglish}{english}
+\DeclareLanguageAlias{austrian}{german}
+\DeclareLanguageAlias{Austrian}{austrian}
+\DeclareLanguageAlias{German}{german}
+\DeclareLanguageAlias{germanb}{german}
+\DeclareLanguageAlias{naustrian}{austrian}
+\DeclareLanguageAlias{ngerman}{german}
+\DeclareLanguageAlias{Greek}{greek}
+\DeclareLanguageAlias{polutonikogreek}{greek}
+\DeclareLanguageAlias{Hebrew}{hebrew}
+\DeclareLanguageAlias{Hungarian}{hungarian}
+\DeclareLanguageAlias{magyar}{hungarian}
+\DeclareLanguageAlias{Magyar}{magyar}
+\DeclareLanguageAlias{Icelandic}{icelandic}
+\DeclareLanguageAlias{Italian}{italian}
+\DeclareLanguageAlias{norsk}{norwegian}
+\DeclareLanguageAlias{Norsk}{norsk}
+\DeclareLanguageAlias{Norwegian}{norwegian}
+\DeclareLanguageAlias{nynorsk}{norwegian}
+\DeclareLanguageAlias{Nynorsk}{nynorsk}
+\DeclareLanguageAlias{Polish}{polish}
+\DeclareLanguageAlias{brazil}{portuges}
+\DeclareLanguageAlias{Brazil}{brazil}
+\DeclareLanguageAlias{brazilian}{portuges}
+\DeclareLanguageAlias{Brazilian}{brazilian}
+\DeclareLanguageAlias{Portuges}{portuges}
+\DeclareLanguageAlias{portuguese}{portuges}
+\DeclareLanguageAlias{Portuguese}{portuguese}
+\DeclareLanguageAlias{Romanian}{romanian}
+\DeclareLanguageAlias{Russian}{russian}
+\DeclareLanguageAlias{Serbocroatian}{serbocroatian}
+\DeclareLanguageAlias{Slovak}{slovak}
+\DeclareLanguageAlias{Slovenian}{slovenian}
+\DeclareLanguageAlias{Spanish}{spanish}
+\DeclareLanguageAlias{Swedish}{swedish}
+\DeclareLanguageAlias{Turkish}{turkish}
+\DeclareLanguageAlias{Ukrainian}{ukrainian}
+
+\endinput
\ No newline at end of file
diff --git a/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc b/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc
index bacfa596b7a..9a410e1d1bf 100644
--- a/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc
+++ b/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc
@@ -250,6 +250,7 @@ depend exercise
 depend exp-testopt
 depend expdlist
 depend export
+depend exsheets
 depend extract
 depend facsimile
 depend fancynum
diff --git a/Master/tlpkg/tlpsrc/exsheets.tlpsrc b/Master/tlpkg/tlpsrc/exsheets.tlpsrc
new file mode 100644
index 00000000000..e69de29bb2d
--- /dev/null
+++ b/Master/tlpkg/tlpsrc/exsheets.tlpsrc