answers 2.12 (15sep09)

git-svn-id: svn://tug.org/texlive/trunk@15323 c570f23f-e606-0410-a88d-b1316a301751

7 files changed, 1107 insertions, 0 deletions

diff --git a/Master/texmf-dist/doc/latex/answers/ansexam1.tex b/Master/texmf-dist/doc/latex/answers/ansexam1.tex
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+%%
+%% This is file `ansexam1.tex',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% answers.dtx  (with options: `ex1')
+%% 
+\documentclass[12pt,a4paper]{article}
+\usepackage{answers}
+\Newassociation{sol}{Solution}{ans}
+\newtheorem{ex}{Exercise}
+\begin{document}
+\Opensolutionfile{ans}[ans1]
+\section{Problems}
+\begin{ex}
+   First exercise
+   \begin{sol}
+      First solution.
+   \end{sol}
+\end{ex}
+\begin{ex}
+   Second exercise
+   \begin{sol}
+      Second solution.
+   \end{sol}
+\end{ex}
+\Closesolutionfile{ans}
+\section{Solutions}
+\input{ans1}
+\end{document}
+\endinput
+%%
+%% End of file `ansexam1.tex'.
diff --git a/Master/texmf-dist/doc/latex/answers/ansexam2.tex b/Master/texmf-dist/doc/latex/answers/ansexam2.tex
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index 00000000000..098efde98f5
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@@ -0,0 +1,62 @@
+%%
+%% This is file `ansexam2.tex',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% answers.dtx  (with options: `ex2')
+%% 
+\documentclass[12pt,a4paper]{article}
+\usepackage{answers}%\usepackage[nosolutionfiles]{answers}
+\newtheorem{Exc}{Exercise}
+\newenvironment{Ex}{\begin{Exc}\normalfont}{\end{Exc}}
+\Newassociation{solution}{Soln}{test}
+\Newassociation{hint}{Hint}{test}
+\Newassociation{Solution}{sSol}{testtwo}
+\newcommand{\prehint}{~[Hint]}
+\newcommand{\presolution}{~[Solution]}
+\newcommand{\preSolution}{~[Homework]}
+\newcommand{\Opentesthook}[2]%
+   {\Writetofile{#1}{\protect\section{#1: #2}}}
+\renewcommand{\Solnlabel}[1]{\emph{Solution #1}}
+\renewcommand{\Hintlabel}[1]{\emph{Hint #1}}
+\renewcommand{\sSollabel}[1]{\emph{Solution to #1}}
+
+\begin{document}
+   \Opensolutionfile{test}[ans2]{Solutions}
+   \Writetofile{test}{\protect\subsection{Some Solutions}}
+   \Opensolutionfile{testtwo}[ans2x]
+   \Writetofile{testtwo}{%
+      \protect\subsection{Extra Solutions}}
+   \section{Exercises}
+   \begin{Ex}
+      An exercise with a solution.
+      \begin{solution}
+         This is a solution.
+         \relax{}
+      \end{solution}
+   \end{Ex}
+   \begin{Ex}
+      An exercise with a hint and a secret solution.
+      \begin{hint}
+         This is a hint.
+      \end{hint}
+      \begin{Solution}
+         This is a secret solution.
+      \end{Solution}
+   \end{Ex}
+   \begin{Ex}
+      An exercise with a hint.
+      \begin{hint}
+         This is a hint.
+      \end{hint}
+   \end{Ex}
+   \Closesolutionfile{test}
+   \Readsolutionfile{test}
+   \clearpage
+   \Closesolutionfile{testtwo}
+   \Readsolutionfile{testtwo}
+\end{document}
+\endinput
+%%
+%% End of file `ansexam2.tex'.
diff --git a/Master/texmf-dist/doc/latex/answers/ansexam3.tex b/Master/texmf-dist/doc/latex/answers/ansexam3.tex
new file mode 100644
index 00000000000..8eb84299f33
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/answers/ansexam3.tex
@@ -0,0 +1,40 @@
+%%
+%% This is file `ansexam3.tex',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% answers.dtx  (with options: `ex3')
+%% 
+\documentclass[12pt,a4paper]{article}
+\usepackage{answers}
+\newenvironment{Ex}[1]{\begin{trivlist}\item \emph{#1} %
+   \renewcommand{\Currentlabel}{#1}}{\end{trivlist}}
+\Newassociation{solution}{Soln}{solutions}
+
+\renewenvironment{Soln}[1]{\begin{trivlist}\item
+   Solution to \emph{#1} }{\end{trivlist}}
+
+\begin{document}
+\section*{Problems}
+   \Opensolutionfile{solutions}[ans3]
+   \begin{Ex}{First exercise}
+      An exercise with a solution.
+      \begin{solution}
+         This is a solution.
+         \relax{}
+      \end{solution}
+   \end{Ex}
+   \begin{Ex}{Second exercise}
+      A second exercise with a solution.
+      \begin{solution}
+         This is another solution.
+      \end{solution}
+   \end{Ex}
+   \Closesolutionfile{solutions}
+\section*{Solutions}
+   \Readsolutionfile{solutions}
+\end{document}
+\endinput
+%%
+%% End of file `ansexam3.tex'.
diff --git a/Master/texmf-dist/doc/latex/answers/answers.pdf b/Master/texmf-dist/doc/latex/answers/answers.pdf
new file mode 100644
index 00000000000..8b7c988c2d5
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/answers/answers.pdf
diff --git a/Master/texmf-dist/source/tex/latex/answers/answers.dtx b/Master/texmf-dist/source/tex/latex/answers/answers.dtx
new file mode 100644
index 00000000000..3f7512d8dea
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+++ b/Master/texmf-dist/source/tex/latex/answers/answers.dtx
@@ -0,0 +1,714 @@
+%    \iffalse meta-comment
+%    \begin{macrocode}
+%<*answers>
+\def\fileversion{2.12}
+\def\filedate{16 Sep 2009 00:00:00 BST}
+\def\filename{answers.dtx}
+%</answers>
+%    \end{macrocode}
+%
+% Originally developed by Mike Piff 
+% Copyright (C) 1990,1994-1996 by Mike Piff   
+% Copyright (C) 2009 by
+%   Joseph Wright <joseph.wright@morningstar2.co.uk>
+%
+% This file may be distributed and/or modified under the conditions of
+% the LaTeX Project Public License (LPPL), either version 1.3c of
+% this license or (at your option) any later version.  The latest
+% version of this license is in the file:
+%
+%   http://www.latex-project.org/lppl.txt
+%
+% This work is "maintained" (as per LPPL maintenance status) by
+%   Joseph Wright.
+%
+%    \fi
+%
+%    \CheckSum{244}
+%
+% \changes{2.0}{1994/03/25}{First version for LaTeX2e}
+% \changes{2.01}{1994/03/30}{Whoops! |ProvidesPackage{answers}|,
+%           not |ProvidesClass{Answers}|!!}
+% \changes{2.02}{1995/08/31}{Removed .drv file from installation}
+% \changes{2.03}{1995/08/31}{Allowed a file handle to open
+%           many files successively, using an optional parameter.}
+% \changes{2.04}{1995/09/08}{Option nosolutionfiles added to allow
+%           solutions to optionally follow problems for tutor's use.
+%           Several minor changes to aid flexibility}
+% \changes{2.05}{1995/09/11}{Better documentation of features added}
+% \changes{2.06}{1996/01/05}{More documentation of features added,
+%           as suggested by David Epstein.}
+% \changes{2.07}{1996/01/08}{Conditionals to check if files were open
+%           were not changed globally. (Spotted by David Epstein.)}
+% \changes{2.08}{1996/01/11}{More examples added.}
+% \changes{2.09}{1996/07/10}{Bug spotted by David Epstein;
+%           I had missed out the definition of the boolean that
+%           checks if a file is open!  Ah well!}
+% \changes{2.12}{2009/09/16}{License change to LPPL}
+% \changes{2.12}{2009/09/16}{New maintainer}
+%
+%
+%    \title{Production of solution sheets in \LaTeXe}
+%    \author{Mike Piff \and Joseph Wright\thanks{joseph.wright@morningstar2.co.uk}}
+%
+%    \maketitle
+%    \tableofcontents
+%
+%    \section{Introduction}
+%
+%    This package is a modification of the author's previous style option
+%    |answers|, which has been in use for a few years,
+%    and was based upon the
+%    \TeX book idea of binding solutions to exercises. I have taken the
+%    opportunity with this revision to alter the format of the solutions,
+%    so that they are now presented as \LaTeX\ environments rather than
+%    being started with a command and ended with the end of the surrounding
+%    environment, a wholly un-\LaTeX y way of doing things!
+%
+%    The other main change is that several file
+%    handles are allowed to be active
+%    at once. This allows some solutions in a book (for instance) to go
+%    to the appendices, and some to go to a separate file, to be printed and
+%    handed to the students as the course progresses.
+%    Moreover, the actual physical files opened with each file handle
+%    can now be varied in the same job, allowing many different files
+%    to be created according to the same format.  Thus, for instance,
+%    each chapter of a book could create its own solution file, allowing
+%    the user to use |\include| on both chapters and solutions.
+%
+%    Finally, any number of solution-types may now be bound to any file, not
+%    just the two old ones, solution and hint.   The format of each solution
+%    type is under the complete control of the user.
+%
+%    \section{The documentation driver file}
+%
+%    This is the driver file that produces this documentation.
+%    We use the document class provided by the \LaTeXe\ distribution
+%    for producing the documentation.
+%    \begin{macrocode}
+%<*driver>
+\documentclass{ltxdoc}
+\RecordChanges
+\begin{document}
+  \DocInput{answers.dtx}
+  \PrintIndex
+  \PrintChanges
+\end{document}
+%</driver>
+%    \end{macrocode}
+%    
+%    \section{User interface}
+%
+%    The package needs to be included with the command
+%    \begin{verbatim}
+%             \usepackage[nosolutionfiles]{answers}
+%    \end{verbatim}
+%    If the optional argument is given, solutions appear at that point
+%    in the text, rather than being written to external files.
+%    This allows a demonstrator's version to be produced.
+%
+%    \DescribeMacro{\Newassociation}
+%    After that, there should be several declarations of the form
+%    \begin{verbatim}
+%        \Newassociation{xxx}{yyy}{zzz}
+%    \end{verbatim}
+%    where |xxx| is an environment in the document, and |yyy| is an
+%    environment which will surround the contents of |xxx| when it is
+%    written to symbolic file handle |zzz|.
+%    The names |xxx|, |yyy| and |zzz| should consist of letters
+%    only, not numbers, punctuation or spaces.
+%
+%    \DescribeMacro{\solutionextension}
+%    By default, output will go to |zzz.tex| if |zzz| is open.
+%    The command |\solutionextension| can be redefined to change |tex| to
+%    some other extension.  Alternatively, the output filename can be
+%    changed as an optional parameter to |\Opensolutionfile|, and each
+%    |\Opensolutionfile| on the same handle can use a different physical
+%    file.  By default, |\solutionpoint| is added before |\solutionextension|.
+%	  Redefine it to remove it. (It has the obvious default value of a
+%    period.
+%
+%    \DescribeMacro{\Opensolutionfile}
+%    \DescribeMacro{\Closesolutionfile}
+%    At some point the user types
+%    \begin{verbatim}
+%        \Opensolutionfile{zzz}
+%        ...
+%        \Closesolutionfile{zzz}
+%    \end{verbatim}
+%    to create a file of solutions written by environments |xxx| to
+%    environments |yyy|.
+%    If this construction is used several times, then several files
+%    of solutions will be created.
+%    The user may wish these files to have different names.
+%    If the form |\Opensolutionfile{zzz}[www]|, then |www.tex| is used as
+%    actual file output name rather than |zzz.tex|.   This allows file
+%    handle |zzz| to create many files |www.tex|, say one for each
+%    chapter of a book, or one for each problem sheet.  These could then
+%    be processed using |\include| commands.  The same value of
+%    |\solutionextension| is used for the optional argument as for the
+%    main argument.
+%    The name |www| should follow the usual file naming conventions.
+%
+%    \DescribeMacro{\Writetofile}
+%    In addition, material can be written directly to a file by means of
+%    |\Writetofile|.
+%    Its first argument is the file handle |zzz| and its second is
+%    the line of text to be written.
+%    It is  most important to remember that any control words
+%    in the line to be written should be preceded by |\protect|,
+%    otherwise the primitive \TeX\ |\write| command will expand them.
+%    Also, as the argument is read in \TeX' usual way before being
+%    written, any trailing spaces after a control word will disappear
+%    unless precautions are taken.  Thus, to write |\xx yyy| to the file,
+%    the user can type |\protect\xx\space yyy|.
+%
+%    \DescribeEnv{Filesave}
+%    Alternatively, a block of text can be saved to file handle
+%    |zzz| by means of
+%    \begin{verbatim}
+%        \begin{Filesave}{zzz}
+%           ....
+%        \end{Filesave}
+%    \end{verbatim}
+%    around it once, |zzz| has been opened.
+%    The restrictions that apply to |\Writetofile| above do not apply
+%    to this environment.
+%
+%    \DescribeMacro{\Readsolutionfile}
+%    One of the generated files can be read using
+%    \begin{verbatim}
+%        \Readsolutionfile{zzz}
+%    \end{verbatim}
+%    provided the file has not been closed and re-opened.
+%    Alternatively, simply |\input| or |\include| it if preferred.
+%
+%     None of the file operations should have any effect if the file
+%     handle |zzz| has not been opened, or if |nosolutionfiles| is specified.
+%
+%    \section{A simple example}
+%
+%    Here is a straightforward example to illustrate how these macros
+%    are used.
+%    \begin{macrocode}
+%<*ex1>
+\documentclass[12pt,a4paper]{article}
+\usepackage{answers}
+\Newassociation{sol}{Solution}{ans}
+\newtheorem{ex}{Exercise}
+\begin{document}
+\Opensolutionfile{ans}[ans1]
+\section{Problems}
+\begin{ex}
+   First exercise
+   \begin{sol}
+      First solution.
+   \end{sol}
+\end{ex}
+\begin{ex}
+   Second exercise
+   \begin{sol}
+      Second solution.
+   \end{sol}
+\end{ex}
+\Closesolutionfile{ans}
+\section{Solutions}
+\input{ans1}
+\end{document}
+%</ex1>
+%    \end{macrocode}
+%
+%    \section{A complicated example}
+%
+%    The following is an (over-complicated) example of the use
+%    of package |answers|.
+%    It uses some of the refinements described later.
+%    \begin{macrocode}
+%<*ex2>
+\documentclass[12pt,a4paper]{article}
+\usepackage{answers}%\usepackage[nosolutionfiles]{answers}
+%    \end{macrocode}
+%    First an environment which contains problems and numbers them.
+%    This is based on a \LaTeX\ theorem, but with a roman body
+%    rather than italic.
+%    \begin{macrocode}
+\newtheorem{Exc}{Exercise}
+\newenvironment{Ex}{\begin{Exc}\normalfont}{\end{Exc}}
+%    \end{macrocode}
+%    Three sorts of solution are written to two different files.
+%    File handle |test| will contain the solutions and hints that the
+%    students will see; |testtwo| contains the solutions to the
+%    problems which they will probably hand in, and so these must be
+%    formatted separately.
+%    \begin{macrocode}
+\Newassociation{solution}{Soln}{test}
+\Newassociation{hint}{Hint}{test}
+\Newassociation{Solution}{sSol}{testtwo}
+%    \end{macrocode}
+%    Because we want to mark different types of problem in the master file of
+%    problems, we define the following.
+%    \begin{macrocode}
+\newcommand{\prehint}{~[Hint]}
+\newcommand{\presolution}{~[Solution]}
+\newcommand{\preSolution}{~[Homework]}
+%    \end{macrocode}
+%    We provide an extra parameter when we open file handle |test|;
+%    this is because we want to write a |\section| command to the
+%    solution file.  This is merely an illustration here, but would be
+%    more relevant if the solution file were |\include|d.
+%    \begin{macrocode}
+\newcommand{\Opentesthook}[2]%
+   {\Writetofile{#1}{\protect\section{#1: #2}}}
+%    \end{macrocode}
+%    The default text produced when \LaTeX meets the solution
+%    environments is here modified.
+%    \begin{macrocode}
+\renewcommand{\Solnlabel}[1]{\emph{Solution #1}}
+\renewcommand{\Hintlabel}[1]{\emph{Hint #1}}
+\renewcommand{\sSollabel}[1]{\emph{Solution to #1}}
+
+\begin{document}
+%    \end{macrocode}
+%    We open handle |test| as actual file |test1.tex|,
+%    \begin{macrocode}
+   \Opensolutionfile{test}[ans2]{Solutions}
+%    \end{macrocode}
+%    and write some text on it.
+%    \begin{macrocode}
+   \Writetofile{test}{\protect\subsection{Some Solutions}}
+%    \end{macrocode}
+%    Handle |testtwo| is opened as |testtwo.tex|.
+%    \begin{macrocode}
+   \Opensolutionfile{testtwo}[ans2x]
+   \Writetofile{testtwo}{%
+      \protect\subsection{Extra Solutions}}
+%    \end{macrocode}
+%    Now the problems.
+%    \begin{macrocode}
+   \section{Exercises}
+   \begin{Ex}
+      An exercise with a solution.
+      \begin{solution}
+         This is a solution.
+         \relax{}
+      \end{solution}
+   \end{Ex}
+   \begin{Ex}
+      An exercise with a hint and a secret solution.
+      \begin{hint}
+         This is a hint.
+      \end{hint}
+      \begin{Solution}
+         This is a secret solution.
+      \end{Solution}
+   \end{Ex}
+   \begin{Ex}
+      An exercise with a hint.
+      \begin{hint}
+         This is a hint.
+      \end{hint}
+   \end{Ex}
+%    \end{macrocode}
+%    We close the two solution files and immediately input their
+%    contents.  We could have used |\include| here.
+%    \begin{macrocode}
+   \Closesolutionfile{test}
+   \Readsolutionfile{test}
+   \clearpage
+   \Closesolutionfile{testtwo}
+   \Readsolutionfile{testtwo}
+\end{document}
+%</ex2>
+%    \end{macrocode}
+%
+%    \section{A further example}
+%
+%    Here is an application to a situation not originally envisaged,
+%    suggested to the author by Martin Osborne.  Here, the exercises and
+%    solutions are not numbered; they are \emph{described}.
+%    \begin{macrocode}
+%<*ex3>
+\documentclass[12pt,a4paper]{article}
+\usepackage{answers}
+\newenvironment{Ex}[1]{\begin{trivlist}\item \emph{#1} %
+   \renewcommand{\Currentlabel}{#1}}{\end{trivlist}}
+\Newassociation{solution}{Soln}{solutions}
+
+\renewenvironment{Soln}[1]{\begin{trivlist}\item
+   Solution to \emph{#1} }{\end{trivlist}}
+
+\begin{document}
+\section*{Problems}
+   \Opensolutionfile{solutions}[ans3]
+   \begin{Ex}{First exercise}
+      An exercise with a solution.
+      \begin{solution}
+         This is a solution.
+         \relax{}
+      \end{solution}
+   \end{Ex}
+   \begin{Ex}{Second exercise}
+      A second exercise with a solution.
+      \begin{solution}
+         This is another solution.
+      \end{solution}
+   \end{Ex}
+   \Closesolutionfile{solutions}
+\section*{Solutions}
+   \Readsolutionfile{solutions}
+\end{document}
+%</ex3>
+%    \end{macrocode}
+%
+%    \StopEventually{}
+%
+%
+%    \section{Identification}
+%
+%    This package can only be used with \LaTeXe, so
+%    an appropriate message is displayed when another
+%    format is used.
+%    \begin{macrocode}
+%<*answers>
+\NeedsTeXFormat{LaTeX2e}
+%    \end{macrocode}
+%
+%
+%    Announce the package name and its version:
+%    \begin{macrocode}
+\ProvidesPackage{answers}
+    [2009/09/16 v2.12 Production of solution sheets in LaTeX2e]
+%    \end{macrocode}
+%
+%  \section{Options}
+%
+%  There is a single option |nosolutionfiles| that
+%  switches output off to files
+%  and produces the solutions here-and-now.
+%
+%    \begin{macrocode}
+\newif\ifanswerfiles \answerfilestrue
+\DeclareOption{nosolutionfiles}{\answerfilesfalse
+   \typeout{No answer files being produced}}%
+\ProcessOptions
+
+%    \end{macrocode}
+%
+%
+%    As this package now relies heavily on the |verbatim| package, we
+%    ensure that that is loaded.
+%    \begin{macrocode}
+\RequirePackage{verbatim}
+%    \end{macrocode}
+%
+%
+%    \section{File handling}
+%
+%    \begin{macro}{\solutionextension}
+%    The default extension for solution files is defined here.
+%    \begin{macrocode}
+\newcommand{\solutionpoint}{.}
+\newcommand{\solutionextension}{tex}
+%    \end{macrocode}
+%    It may be changed with |\renewcommand|.
+%    \end{macro}
+%
+%    \begin{environment}{Filesave}
+%    We define an environment |Filesave| with one parameter, the file handle.
+%    It is similar to the example of Sch\"opf in the
+%    description of |verbatim|.
+%    \begin{macrocode}
+\newenvironment{Filesave}[1]{%
+   \@bsphack
+   \def\verbatim@processline{}%
+   \Iffileundefined{#1}{}{%
+      \Ifopen{#1}{%
+         \def\verbatim@processline{%
+            \Ifanswerfiles{%
+               \immediate\write\@nameuse{#1@file}%
+                  {\the\verbatim@line}%
+            }{}%
+         }%
+      }{}%
+   }%
+   \let\do\@makeother\dospecials
+   \catcode`\^^M\active \catcode`\^^I=12\relax
+   \verbatim@start
+}{\@esphack}
+%    \end{macrocode}
+%    \end{environment}
+%
+%    \begin{macro}{\Writetofile}
+%    It is also useful to have a command to write material to the file.
+%    In this, you need to put |\protect| before any control words in the
+%    argument that might expand prematurely and create havoc.
+%    \begin{macrocode}
+\newcommand{\Writetofile}[2]{%
+   \@bsphack
+   \Iffileundefined{#1}{}{%
+      \Ifopen{#1}{%
+         {%
+            \let\protect\string
+            \Ifanswerfiles{%
+               \immediate\write\@nameuse{#1@file}{#2}%
+            }{}%
+         }%
+      }{}%
+   }%
+   \@esphack
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\Ifopen}
+%    We need to check whether or not a file is already open.
+%    \begin{macrocode}
+\newcommand{\Ifopen}[3]{%
+   \csname if#1open\endcsname#2\else#3\fi}%
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\Iffileundefined}
+%    We also need to check whether a file variable has already been defined
+%    for a given file handle.
+%    \begin{macrocode}
+\newcommand{\Iffileundefined}[3]{%
+   \csname ifx\expandafter\endcsname
+      \csname #1@file\endcsname\relax
+      #2\else#3\fi}
+%    \end{macrocode}
+%    \end{macro}
+%    Finally, we need a check as to whether we are outputting answers to a
+%    file or not
+%    \begin{macrocode}
+\newcommand{\Ifanswerfiles}[2]{%
+   \ifanswerfiles #1\else #2\fi}
+%    \end{macrocode}
+%
+%
+%
+%    \section{The file interface}
+%
+%    \begin{macro}{\Opensolutionfile}
+%    Before we can write solutions, we must open the solution file(s).
+%    The command to do this takes a single parameter, which should usually be
+%    a file name without extension. Thus it should probably be
+%    restricted to a string of at most 8 letters for portability.
+%    This operation will not truncate any existing open file.
+%    However, if the second optional parameter is specified, this
+%    determines the actual filename, and the first parameter is then
+%    an arbitrary symbolic file handle name.
+%    \begin{macrocode}
+\def\Opensolutionfile#1{%
+   \@ifnextchar[{\define@filename{#1}}%
+      {\define@filename{#1}[#1]}}%
+\def\define@filename#1[#2]{%
+   \global\@namedef{#1@filename}{#2\solutionpoint\solutionextension}%
+   \Ifanswerfiles{%
+      \typeout{Output from handle #1 going
+         to #2.\solutionextension}%
+   }{}%
+   \Iffileundefined{#1}{%
+      \expandafter\newwrite\csname #1@file\endcsname
+      \csname newif\expandafter\endcsname
+         \csname if#1open\endcsname
+      \global\csname #1openfalse\endcsname
+      \expandafter\ifx\csname Open#1hook\endcsname\relax
+         \global\@namedef{Open#1hook}##1{}%
+      \fi
+      \expandafter\ifx\csname Close#1hook\endcsname\relax
+         \global\@namedef{Close#1hook}##1{}%
+      \fi
+   }{}%
+   \let\Tmp\relax
+   \Ifopen{#1}{\typeout{File #1 already open}}{%
+      \Ifanswerfiles{%
+         \immediate\openout\@nameuse{#1@file}=%
+         \@nameuse{#1@filename}%
+      }{}%
+      \global\csname#1opentrue\endcsname
+      \def\Tmp{\@nameuse{Open#1hook}{#1}}%
+   }%
+   \Tmp
+}
+%    \end{macrocode}
+%    \begin{macro}{\Closesolutionfile}
+%    We also have a command to close an already open file.
+%    \begin{macrocode}
+\def\Closesolutionfile#1{%
+   \let\Tmp\relax
+   \Iffileundefined{#1}{}{%
+      \Ifopen{#1}{%
+         \Ifanswerfiles{%
+            \immediate\closeout\@nameuse{#1@file}%
+         }{}%
+         \global\csname #1openfalse\endcsname
+         \def\Tmp{\@nameuse{Close#1hook}{#1}}%
+      }{}%
+   }%
+   \Tmp
+}
+%    \end{macrocode}
+%
+%    Note that the two file commands each provide a hook which allows them to
+%    perform extra tasks.
+%    For instance, the opening operation could be made to
+%    write extra information to the file by redefining the appropriate hook.
+%    The closing operation could if required do an immediate |\input| of the
+%    solution file contents. For example,
+%    \begin{verbatim}
+%        \newcommand{\Openxxxhook}[2]{%
+%           \Writetofile{#1}{\protect\section{#2}}%
+%        }%
+%        \newcommand{\Closexxxhook}[1]{%
+%           \Readsolutionfile{#1}%
+%        }
+%    \end{verbatim}
+%    and then
+%    \begin{verbatim}
+%        \Opensolutionfile{xxx}{Answers to selected problems}
+%        ...
+%        \Closesolutionfile{xxx}
+%    \end{verbatim}
+%    The default behaviour is to ignore the one parameter. Note that if you
+%    redefine their behaviour, you must remember that the first parameter is
+%    always the file handle.
+%    \end{macro}
+%    \end{macro}
+%
+%    \begin{macro}{\Readsolutionfile}
+%    The operation of reading the file of solutions can be done with the
+%    following command.
+%    \begin{macrocode}
+\def\Readsolutionfile#1{%
+   \Ifanswerfiles{%
+      \Iffileundefined{#1}{}{%
+         \Ifopen{#1}{%
+            \typeout{WARNING: attempt to read open file #1}%
+         }{%
+            \edef\Tmp{%
+               \noexpand\InputIfFileExists
+                  {\@nameuse{#1@filename}}{}%
+               {\noexpand\message{File
+                  \@nameuse{#1@filename}%
+                     \space not found}}%
+            }%
+            \Tmp
+         }%
+      }%
+   }{}%
+}
+
+%    \end{macrocode}
+%    \end{macro}
+%
+%
+%    \section{The solution interface}
+%
+%    \begin{macro}{\Newassociation}
+%    Several solution file handles may have been defined.
+%    You are limited only by the
+%    number that \TeX\ will make available to you. Each solution environment
+%    that is to write to one of these handles
+%    must know which handle to write to,
+%    and also what extra information to write there, apart from its contents.
+%    This is done by setting up an association
+%    between the source environment,
+%    the destination environment and the file handle.
+%    \begin{macrocode}
+\newcommand{\Newassociation}[3]{%
+   \newsolution{#2}%
+   \expandafter\ifx\csname #3opentrue\endcsname\relax
+      \expandafter\newif\csname if#3open\endcsname
+   \fi
+   \newenvironment{#1}{%
+      \Ifanswerfiles{%
+         \let\Tmp\relax
+         \Iffileundefined{#3}{}{%
+            \Ifopen{#3}{%
+               \immediate\write\@nameuse{#3@file}%
+                  {\string\begin{#2}\@nameuse{#2params}}%
+            \def\Tmp{\Filesave{#3}}%
+            }{}%
+         }%
+      }{%
+         \edef\Tmp{\noexpand\begin{#2}\@nameuse{#2params}}%
+      }%
+      \csname pre#1\endcsname
+      \Tmp
+   }%
+   {%
+      \Ifanswerfiles{%
+         \Iffileundefined{#3}{}{%
+            \Ifopen{#3}{%
+               \endFilesave%
+               \immediate\write\@nameuse{#3@file}%
+                  {\string\end{#2}}%
+               \csname post#1\endcsname
+            }{}%
+         }%
+      }{%
+         \end{#2}%
+      }%
+   }%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\newsolution}
+%    The default destination environment in the solution file is defined to
+%    take a single parameter, a reference number inherited from the source
+%    environment.  This is set with style |\solutionstyle|, which defaults
+%    to |\textbf|.  In addition, solution type |yyy| can have markup added
+%    before and after it by defining |\preyyy| and |\postyyy| suitably,
+%    eg, a rule across the width of the page or a square.
+%    If anything more sophisticated is intended, it is probably better to
+%    |\renewenvironment{yyy}| to achieve it.
+%    \begin{macro}{\Currentlabel}
+%    \begin{macrocode}
+\newcommand{\newsolution}[1]{%
+   \@ifundefined{#1}{%
+      \global\@namedef{#1params}{{\Currentlabel}}%
+      \newenvironment{#1}[1]%
+      {%
+         \csname pre#1\endcsname
+         \trivlist
+         \item[\hskip\itemsep{\@nameuse{#1label}{##1}}]}%
+      {\csname post#1\endcsname\endtrivlist}%
+      \global\@namedef{#1label}##1{\solutionstyle{##1}}%
+   }{\typeout{WARNING: environment #1 already in use}}%
+}
+\newcommand{\solutionstyle}[1]{\textbf{#1}}
+\newcommand{\Currentlabel}{\@currentlabel}
+%    \end{macrocode}
+%    The format of the label for solution environment |xxx| is governed
+%    by the command |\xxxlabel|, which takes one argument by default.
+%    The argument is passed to it by the command |\xxxparams|,
+%    which expands to |{\Currentlabel}|, a synonym for |{\@currentlabel}|,
+%    and this argument is written automatically by the source environment.
+%    The label appears in boldface by default.
+%    We could easily change the behaviour of this environment by changing
+%    these two commands. For example
+%    \begin{verbatim}
+%        \renewcommand{\xxxlabel}[1]{\emph{Solution to #1}}
+%        \renewcommand{\xxxparams}{{\Currentlabel(p.\thepage)}}
+%    \end{verbatim}
+%    would provide a number and page reference in italic.
+%
+%    More complicated behaviour could be produced by redefining the |xxx|
+%    environment itself to take a different number of parameters. Note
+%    however that |\xxxparams| must be redefined to provide those parameters.
+%    \end{macro}
+%    \end{macro}
+%
+%    Which brings us to the end of the |answers| package.
+%    \begin{macrocode}
+%</answers>
+%    \end{macrocode}
+%
+%
+%
+% \Finale
+%
+\endinput
+%
diff --git a/Master/texmf-dist/source/tex/latex/answers/answers.ins b/Master/texmf-dist/source/tex/latex/answers/answers.ins
new file mode 100644
index 00000000000..9f6d954eacb
--- /dev/null
+++ b/Master/texmf-dist/source/tex/latex/answers/answers.ins
@@ -0,0 +1,64 @@
+%%
+%% This file will generate fast loadable files and documentation
+%% driver files from the doc files in this package when run through
+%% LaTeX or TeX.
+%%
+%%
+%% IMPORTANT NOTICE:
+%%
+%% No other permissions to copy or distribute this file in any form
+%% are granted and in particular no permission to modify its contents.
+%%
+%% --------------- start of docstrip commands ------------------
+%%
+\def\batchfile{answers.ins}
+\input docstrip.tex
+\preamble
+
+Originally developed by Mike Piff 
+Copyright (C) 1990,1994-1996 by Mike Piff  
+Copyright (C) 2009 by
+  Joseph Wright <joseph.wright@morningstar2.co.uk>
+  
+It may be distributed and/or modified under the conditions of
+the LaTeX Project Public License (LPPL), either version 1.3c of
+this license or (at your option) any later version.  The latest
+version of this license is in the file:
+
+   http://www.latex-project.org/lppl.txt
+
+This work is "maintained" (as per LPPL maintenance status) by
+  Joseph Wright.
+
+\endpreamble
+
+\keepsilent
+
+\def\Ask#1#2{\def#1{y}}
+
+\Msg{*** Generating the package file ***}
+
+\generate{\file{answers.sty}{\from{answers.dtx}{answers}}}
+
+\preamble
+\endpreamble
+
+\Msg{*** Generating example files ***}
+
+\generate{%
+   \file{ansexam1.tex}{\from{answers.dtx}{ex1}}
+   \file{ansexam2.tex}{\from{answers.dtx}{ex2}}
+   \file{ansexam3.tex}{\from{answers.dtx}{ex3}}
+}
+
+\ifToplevel{%
+\Msg{***********************************************************}
+\Msg{*}
+\Msg{* To finish the installation you have to move the file}
+\Msg{* answers.sty into a directory searched by TeX:}
+\Msg{* To produce the documentation, run the file answers.dtx through LaTeX.}
+\Msg{* To see an example, run the file answexam.tex through LaTeX.}
+\Msg{***********************************************************}
+}
+
+\endinput
diff --git a/Master/texmf-dist/tex/latex/answers/answers.sty b/Master/texmf-dist/tex/latex/answers/answers.sty
new file mode 100644
index 00000000000..4c0d88c2cc2
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/answers/answers.sty
@@ -0,0 +1,193 @@
+%%
+%% This is file `answers.sty',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% answers.dtx  (with options: `answers')
+%% 
+%% Originally developed by Mike Piff
+%% Copyright (C) 1990,1994-1996 by Mike Piff
+%% Copyright (C) 2009 by
+%%   Joseph Wright <joseph.wright@morningstar2.co.uk>
+%% 
+%% It may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License (LPPL), either version 1.3c of
+%% this license or (at your option) any later version.  The latest
+%% version of this license is in the file:
+%% 
+%%    http://www.latex-project.org/lppl.txt
+%% 
+%% This work is "maintained" (as per LPPL maintenance status) by
+%%   Joseph Wright.
+%% 
+\def\fileversion{2.12}
+\def\filedate{16 Sep 2009 00:00:00 BST}
+\def\filename{answers.dtx}
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{answers}
+    [2009/09/16 v2.12 Production of solution sheets in LaTeX2e]
+\newif\ifanswerfiles \answerfilestrue
+\DeclareOption{nosolutionfiles}{\answerfilesfalse
+   \typeout{No answer files being produced}}%
+\ProcessOptions
+
+\RequirePackage{verbatim}
+\newcommand{\solutionpoint}{.}
+\newcommand{\solutionextension}{tex}
+\newenvironment{Filesave}[1]{%
+   \@bsphack
+   \def\verbatim@processline{}%
+   \Iffileundefined{#1}{}{%
+      \Ifopen{#1}{%
+         \def\verbatim@processline{%
+            \Ifanswerfiles{%
+               \immediate\write\@nameuse{#1@file}%
+                  {\the\verbatim@line}%
+            }{}%
+         }%
+      }{}%
+   }%
+   \let\do\@makeother\dospecials
+   \catcode`\^^M\active \catcode`\^^I=12\relax
+   \verbatim@start
+}{\@esphack}
+\newcommand{\Writetofile}[2]{%
+   \@bsphack
+   \Iffileundefined{#1}{}{%
+      \Ifopen{#1}{%
+         {%
+            \let\protect\string
+            \Ifanswerfiles{%
+               \immediate\write\@nameuse{#1@file}{#2}%
+            }{}%
+         }%
+      }{}%
+   }%
+   \@esphack
+}
+\newcommand{\Ifopen}[3]{%
+   \csname if#1open\endcsname#2\else#3\fi}%
+\newcommand{\Iffileundefined}[3]{%
+   \csname ifx\expandafter\endcsname
+      \csname #1@file\endcsname\relax
+      #2\else#3\fi}
+\newcommand{\Ifanswerfiles}[2]{%
+   \ifanswerfiles #1\else #2\fi}
+\def\Opensolutionfile#1{%
+   \@ifnextchar[{\define@filename{#1}}%
+      {\define@filename{#1}[#1]}}%
+\def\define@filename#1[#2]{%
+   \global\@namedef{#1@filename}{#2\solutionpoint\solutionextension}%
+   \Ifanswerfiles{%
+      \typeout{Output from handle #1 going
+         to #2.\solutionextension}%
+   }{}%
+   \Iffileundefined{#1}{%
+      \expandafter\newwrite\csname #1@file\endcsname
+      \csname newif\expandafter\endcsname
+         \csname if#1open\endcsname
+      \global\csname #1openfalse\endcsname
+      \expandafter\ifx\csname Open#1hook\endcsname\relax
+         \global\@namedef{Open#1hook}##1{}%
+      \fi
+      \expandafter\ifx\csname Close#1hook\endcsname\relax
+         \global\@namedef{Close#1hook}##1{}%
+      \fi
+   }{}%
+   \let\Tmp\relax
+   \Ifopen{#1}{\typeout{File #1 already open}}{%
+      \Ifanswerfiles{%
+         \immediate\openout\@nameuse{#1@file}=%
+         \@nameuse{#1@filename}%
+      }{}%
+      \global\csname#1opentrue\endcsname
+      \def\Tmp{\@nameuse{Open#1hook}{#1}}%
+   }%
+   \Tmp
+}
+\def\Closesolutionfile#1{%
+   \let\Tmp\relax
+   \Iffileundefined{#1}{}{%
+      \Ifopen{#1}{%
+         \Ifanswerfiles{%
+            \immediate\closeout\@nameuse{#1@file}%
+         }{}%
+         \global\csname #1openfalse\endcsname
+         \def\Tmp{\@nameuse{Close#1hook}{#1}}%
+      }{}%
+   }%
+   \Tmp
+}
+\def\Readsolutionfile#1{%
+   \Ifanswerfiles{%
+      \Iffileundefined{#1}{}{%
+         \Ifopen{#1}{%
+            \typeout{WARNING: attempt to read open file #1}%
+         }{%
+            \edef\Tmp{%
+               \noexpand\InputIfFileExists
+                  {\@nameuse{#1@filename}}{}%
+               {\noexpand\message{File
+                  \@nameuse{#1@filename}%
+                     \space not found}}%
+            }%
+            \Tmp
+         }%
+      }%
+   }{}%
+}
+
+\newcommand{\Newassociation}[3]{%
+   \newsolution{#2}%
+   \expandafter\ifx\csname #3opentrue\endcsname\relax
+      \expandafter\newif\csname if#3open\endcsname
+   \fi
+   \newenvironment{#1}{%
+      \Ifanswerfiles{%
+         \let\Tmp\relax
+         \Iffileundefined{#3}{}{%
+            \Ifopen{#3}{%
+               \immediate\write\@nameuse{#3@file}%
+                  {\string\begin{#2}\@nameuse{#2params}}%
+            \def\Tmp{\Filesave{#3}}%
+            }{}%
+         }%
+      }{%
+         \edef\Tmp{\noexpand\begin{#2}\@nameuse{#2params}}%
+      }%
+      \csname pre#1\endcsname
+      \Tmp
+   }%
+   {%
+      \Ifanswerfiles{%
+         \Iffileundefined{#3}{}{%
+            \Ifopen{#3}{%
+               \endFilesave%
+               \immediate\write\@nameuse{#3@file}%
+                  {\string\end{#2}}%
+               \csname post#1\endcsname
+            }{}%
+         }%
+      }{%
+         \end{#2}%
+      }%
+   }%
+}
+\newcommand{\newsolution}[1]{%
+   \@ifundefined{#1}{%
+      \global\@namedef{#1params}{{\Currentlabel}}%
+      \newenvironment{#1}[1]%
+      {%
+         \csname pre#1\endcsname
+         \trivlist
+         \item[\hskip\itemsep{\@nameuse{#1label}{##1}}]}%
+      {\csname post#1\endcsname\endtrivlist}%
+      \global\@namedef{#1label}##1{\solutionstyle{##1}}%
+   }{\typeout{WARNING: environment #1 already in use}}%
+}
+\newcommand{\solutionstyle}[1]{\textbf{#1}}
+\newcommand{\Currentlabel}{\@currentlabel}
+\endinput
+%%
+%% End of file `answers.sty'.