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+# The exesheet class and package - Typesetting exercise or exam sheets
+
+
+## Presentation
+
+The exesheet package is used for typesetting exercise or exam sheets. 
+In addition, the exesheet class loads the schooldocs package.
+
+The package provides:
+- macros to mark out exercises and subparts,
+- specific settings for enumeration lists, 
+- environments for questions and answers, with conditional display,
+- macros for marking scheme with detailed comments.
+
+
+## Installation
+
+- run LaTeX on exesheet.ins, you obtain the files exesheet.cls and exesheet.sty,
+- if then you run LaTeX + dvips + ps2pdf on exesheet.dtx you get the file exesheet.pdf which is also in the archive,
+- put the files exesheet.cls, exesheet.sty and exesheet.pdf in your TeX Directory Structure.
+
+
+## Author
+
+Antoine Missier 
+
+Email: antoine.missier@ac-toulouse.fr
+
+
+## License
+
+Released under the LaTeX Project Public License v1.3 or later. 
+See http://www.latex-project.org/lppl.txt
diff --git a/macros/latex/contrib/exesheet/exesheet.dtx b/macros/latex/contrib/exesheet/exesheet.dtx
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+% \iffalse meta-comment
+%
+% Copyright (C) 2020 by Antoine Missier <antoine.missier@ac-toulouse.fr>
+% ----------------------------------------------------------------------
+% 
+% This file 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.
+%
+% \fi
+%
+% \iffalse
+%<*driver>
+\ProvidesFile{exesheet.dtx}
+%</driver>
+%<class|package>\NeedsTeXFormat{LaTeX2e}[2005/12/01]
+%<class>\ProvidesClass{exesheet}
+%<package>\ProvidesPackage{exesheet}
+%<*class|package>
+    [2020/07/22 v1.0 .dtx exesheet file]
+%</class|package>
+%
+%<*driver>
+\documentclass{ltxdoc}
+% uncomment the following lines if you want to use the exesheet class instead of ltxdoc
+%\usepackage{doc}
+%\AtBeginDocument{\MakeShortVerb{\|}}
+%\providecommand\marg[1]{{\ttfamily\{}\meta{#1}{\ttfamily\}}}
+%\providecommand\oarg[1]{{\ttfamily[}\meta{#1}{\ttfamily]}}
+\usepackage[notoc]{exesheet}
+\usepackage{schooldocs}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage[english]{babel}
+\usepackage{lmodern}
+\usepackage{multicol}
+\usepackage{hyperref}
+\usepackage{sectsty}
+\usepackage{pstricks}
+\psset{unit=1cm}
+\geometry{textwidth=355pt,vmarginratio=1:1,hmarginratio=3:2}
+% altered by schoodocs, now very close from the default geometry used by ltxdoc
+
+\newcommand{\ds}{\displaystyle}
+\newcommand{\bs}{\textbackslash}
+\newcommand{\TODO}{\textcolor{green}{TODO}}
+
+\definecolor{darkbrown}{rgb}{0.5,0.1,0.1}
+\allsectionsfont{\sffamily\color{darkbrown}}
+\renewcommand{\labelexercisestyle}{\rmfamily\color{black}}
+\renewcommand{\labelsubpartstyle}{\rmfamily\color{black}}
+\renewcommand{\annexstyle}{\rmfamily\color{black}\MakeUppercase}
+\renewcommand{\correctionstyle}{\rmfamily\color{correctioncolor}}
+
+\displaypts
+%\diplaynotes gives a non desired margin ratio here
+% following instructions simulate \displaynotes without altering the margin ratio
+\setlength{\marginparwidth}{\oddsidemargin}
+\addtolength{\marginparwidth}{1in}
+\addtolength{\marginparwidth}{-\marginparsep}
+\setlength{\marginparwidth}{0.8\marginparwidth}
+\setboolean{marginpoints}{true}
+\setboolean{marginfullnotes}{true}
+
+\DisableCrossrefs         
+%\CodelineIndex
+%\RecordChanges
+
+\title{The \textsf{exesheet} class and package}%\thanks{This document
+%    corresponds to \textsf{exesheet}~\fileversion, dated \filedate.}}
+%\author{Antoine Missier \\ \texttt{antoine.missier@ac-toulouse.fr}}
+\subject{Antoine Missier \\
+    \texttt{antoine.missier@ac-toulouse.fr}}
+\date{July 22, 2020, \fileversion}
+\hypersetup{%
+    colorlinks, 
+    linkcolor=blue,
+    pdftitle={exesheet}, 
+    pdfsubject={LaTeX class and package}, 
+    pdfauthor={Antoine Missier}
+    }
+\begin{document}
+  \DocInput{exesheet.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+% \CheckSum{637}
+%
+% \CharacterTable
+%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+%   Digits        \0\1\2\3\4\5\6\7\8\9
+%   Exclamation   \!     Double quote  \"     Hash (number) \#
+%   Dollar        \$     Percent       \%     Ampersand     \&
+%   Acute accent  \'     Left paren    \(     Right paren   \)
+%   Asterisk      \*     Plus          \+     Comma         \,
+%   Minus         \-     Point         \.     Solidus       \/
+%   Colon         \:     Semicolon     \;     Less than     \<
+%   Equals        \=     Greater than  \>     Question mark \?
+%   Commercial at \@     Left bracket  \[     Backslash     \\
+%   Right bracket \]     Circumflex    \^     Underscore    \_
+%   Grave accent  \`     Left brace    \{     Vertical bar  \|
+%   Right brace   \}     Tilde         \~}
+%
+%
+% \changes{v0.0}{2010/09/01}{Initial personal version}
+% \changes{v0.9}{2020/01/02}{Initial documentation in french}
+% \changes{v1.0}{2020/07/22}{Initial public version with documentation in english}
+%
+% \GetFileInfo{exesheet.dtx}
+%
+% \maketitle
+% \tableofcontents
+%
+% \section{Introduction}
+%
+% The \textsf{exesheet} \emph{package} is used for typesetting exercise or exam sheets.
+% In addition, the \textsf{exesheet} \emph{class} loads the \textsf{schooldocs} package.
+% This one makes adjustments for margins and title and defines various layout styles 
+% with particular header and footer, appropriate for exercise sheets (among others).
+% See the \textsf{schooldocs} documentation for more details.
+% The \textsf{exesheet} \emph{class} is based on \textsf{article} 
+% and has the same options.
+%
+% Many other packages are dedicated to exercise sheets.
+% Most propose to encapsulate each exercise in an environment
+% while \textsf{exesheet} begins each exercise with the |\exercise| command, 
+% which works like a subsection (with same features)
+% and is suitable for documents consisting exclusively of exercises.
+% The package provides also alternative formatting, 
+% more relevant for short exercises.
+%
+% Another specificity of the \textsf{exesheet} package is specific settings
+% for enumeration lists, different from \LaTeX\ standard settings,
+% usefull for the numbering of questions or answers inside an exercise.
+%
+% Other packages provide often more or less elaborate mechanisms
+% to manage the placement of answers.
+% \textsf{exesheet} has no such ambitions:
+% for all exercises of the sheet, we can display subject only, 
+% answer anly or both, but always at the place they are inserted
+% in the source file. On the other hand this choice may be very flexible:
+% we can do a correct version for all exercises together, or a correct version per exercise,
+% per part (subpart of exercise), per question, per sub-question.
+%
+% Finally the original fonctionality of this package is the display of a detailed marking scheme,
+% with optional explanations, in the margin of exercise answers.
+%
+% There are two possible options: \texttt{notoc} (see \ref{par:notoc})
+% and \texttt{nosetlist} (see \ref{par:nosetlist}).
+%
+%\medskip
+% In the current document, a frame is used to highlight 
+% examples beside the rest of the documentation.
+%
+% \section{Titles}
+% \subsection{The \texttt{\bs exercise} command}
+
+% \DescribeMacro{\exercise}
+% Each exercise begins with the |\exercise|\oarg{opt} command. 
+% This command typesets \textbf{\exercisename}, as a document
+% subsection, followed by automatic numbering,
+% unique for the whole document.
+% The optional parameter \meta{opt} is used to put additional text
+% on the same title line, for example to precise a subject or a marking scheme.
+% |\exercise[ (to begin)]| yields:
+%
+% \exercise[ (to begin)]
+% \psframe(-0.25,1.3)(12.75,-0.4)
+% Try to use this first command now, it's easy.
+%
+% \bigskip
+% To bring additional text closer to the exercise number, 
+% we can use the |\unskip| command
+% which eliminates preceding space, see the following example, obtained with
+% |\exercise[\unskip : calculation]|:
+% \exercise[\unskip: calculation]
+% \psframe(-0.25,1.3)(12.75,-0.4)
+% Calculate $1+1$.
+%
+% \bigskip
+% \DescribeMacro{\exercisename}
+% The word \emph{\exercisename} has automatic translation in a few languages\footnote{Translation 
+% is currently integrated into the package for the following languages: French,
+% German, Spanish, Italian, Portuguese.}
+% when the \textsf{babel} package is loaded.
+% It can be redefined, with |\renewcommand|, which should be placed 
+% after |\begin{document}|, or else we can use macros from the \textsf{babel} package (allowing dynamic language change), e.g.\\
+% |\addto\captionssweedish{\def\exercisename{\"Ovning}}| (in the preamble).
+%
+% \DescribeMacro{\labelexercise}
+% This command calls |\exercisename| following by the exercise number.
+% It can be redefined. For example, to add a period after the exercise number:
+% |\renewcommand{\labelexercise}{\exercisename~\theexercise.}|
+%
+% \DescribeMacro{\theexercise}
+% To change only the numbering type, redefine
+% the |\theexercise| command, based on the |exercise| counter.
+%
+% \DescribeMacro{\labelexercisestyle}
+% This macro (which is empty by default) allows to define a particular style
+% for exercise titles. In the present document, we defined in the preamble:
+% |\renewcommand{\labelexercisestyle}{\rmfamily\color{black}}|\footnote{In the 
+% present document, to highlight real sections and subsections titles,
+% their color and font have been modified with the
+% \texttt{\bs allsectionsfont} macro from the \textsf{sectsty} package.}.
+%
+% \bigskip
+% \DescribeMacro{\exercise*}
+% The starred version |\exercise*|\oarg{opt}\marg{label}
+% allows to choose another \meta{label} for a particular exercise
+% and removes the numbering. For instance:
+% |\exercise*[(Fermat theorem)]{Problem}| yields:
+%
+% \exercise*[(Fermat theorem)]{Problem}
+% \psframe(-0.25,1.3)(12.75,-0.7)
+% Proove that there are no positive integers $x, y, z$ such that $x^n+y^n=z^n$
+% for any integer $n$ greater than 2.
+%
+% \subsection{The \texttt{\bs subpart} command}
+%
+% \DescribeMacro{\subpart}
+% An exercise may contain several parts that we obtain 
+% with the |\subpart|\oarg{opt} command, typeset like a subsubsection.
+% \exercise
+% \subpart[(preliminary)]
+% \psframe(-0.25,1.95)(12.75,-1.9)
+% First of all, prepare your cup of tea.
+% \subpart
+% Now you are ready to make the current exercise.
+%
+% \bigskip
+% \DescribeMacro{\thesubpart}
+% By default, the subpart numbering uses letters : A, B, C, etc.
+% This numbering type can be redefined with the |\thesubpart| command based on
+% the |subpart| counter, for instance |\renewcommand\thesubpart{\arabic{subpart}}|.
+%
+% \DescribeMacro{\subpartname} \DescribeMacro{\labelsubpart} 
+% \DescribeMacro{\labelsubpartstyle}
+% As for |\exercise|, the |\subpart| command
+% uses |\subpartname| (with automatic translation in a few languages
+% if \textsf{babel} is loaded),
+% |\labelsubpart| and |\labelsubpartstyle|, which are editable.
+% \pagebreak
+%
+% \DescribeMacro{\subpart*}
+% Like |\exercise*|, the starred version |\subpart*|\oarg{opt}\marg{label}
+% allows to freely typeset the subpart \marg{label}, for instance
+% |\subpart*{First part}|.
+%
+% \subsection{The \texttt{\bs annex} command}
+% \DescribeMacro{\annex}
+% The |\annex|\oarg{opt} command typesets the title \textbf{ANNEX}, in uppercase letters, centred
+% and in the subsection style,
+% with an optional parameter, added on the same line.
+%
+% \vspace{-\baselineskip}
+% \noindent\psframe(-0.25,-0.25)(12.75,-1.25)
+% \annex[(to return)]
+%
+% \DescribeMacro{\annexname}
+% The word \emph{\annexname} has automatic translation in a few languages
+% if \textsf{babel} package is loaded.
+% It can be extended to other languages or modified by redifining |\annexname|.
+%
+% \DescribeMacro{\annexstyle}
+% The annex title style is set by the |\annexstyle| macro,
+% defined as follows: |\newcommand\annexstyle{\MakeUppercase}|.
+% This command may be redefined as one wants.
+%
+% \subsection{Exercise titles in table of contents 
+% (notoc package option)} \label{par:notoc}
+% \DescribeMacro{notoc}
+% By default, the titles \emph{\exercisename}, \emph{\subpartname} or \emph{\annexname},
+% appear in the table of contents
+% (or in the pdf file summary when \textsf{hyperref} package is used). 
+% To avoid this, you can set the boolean \texttt{notoc} to \texttt{true}
+% or call the \textsf{exesheet} package (or class) with \texttt{notoc} option.
+% But notice that title optional arguments will always be ignored in the table of contents.
+%
+% \subsection{Short exercises: the \texttt{\bs exe} command}
+% \DescribeMacro{\exe}
+% The |\exe| command starts an exercise by the abbreviation \textbf{\exname}.\ followed by the exercise number,
+% without using sectioning commands, and the exercise body begins on the same
+% line. An exercise starts a new paragraph without indentation.
+%
+% \exe This is a short exercise who
+% can contain several paragraphs or questions however.
+%
+% \noindent\psframe(-0.25,1.4)(12.75,-1.2)
+% \indent Here for example starts a new paragraph.
+% \exe This is another short exercise.
+%
+% \bigskip
+% \DescribeMacro{\exname} \DescribeMacro{\exlabel} \DescribeMacro{\exsepmark}
+% The abbreviation \emph{\exname} may be changed by
+% redefining |\exname|.
+% The |\exlabel| macro calls |\exname| following by a period then the exercise number,
+% and |\exsepmark| typesets a long dash.
+% We may change these features by redefining these commands.
+%
+% \bigskip
+% \DescribeMacro{\exe*}
+% The starred version prints no separator as shown below:
+%
+% \vspace{-\baselineskip}
+% \noindent\psframe(-0.25,-0.35)(12.75,-1.2) 
+% \exe* Another short exercise without separator.
+%
+% \subsection{The \texttt{\bs points} command}
+% \DescribeMacro{\points}
+% The |\points|\marg{pts} command displays the number of points awarded to an exercise.
+% It is intended to be entered in the optional argument of the 
+% |\exercise| command\footnote{This command which has to be used
+% in the optional argument of \texttt{\bs exercise}, as several others presented below, is incompatible with
+% the \textsf{memoir} class which redefines section commands.}.
+% |\exercise[\points{5}]| yields:
+% \exercise[\points{5}]
+% \psframe(-0.25,1.3)(12.75,-0.4)
+% Try to read this whole document without drinking tea and you get five points.
+%
+% \bigskip
+% \DescribeMacro{\pointsname} \DescribeMacro{\pointname}
+% Like before, the words \emph{points} and in the singular \emph{point}
+% (if \meta{pts} is inferior to 2)
+% get automatic translation (with \textsf{babel}) in a few languages
+% and are modifiables.
+% 
+% \DescribeMacro{\pointsstyle} \DescribeMacro{pointscolor}
+% The style used by the |\points| command may be redefined with |\pointsstyle|. 
+% The color is set by |pointscolor| with the |\definecolor| command
+% (from the \textsf{xcolor} package by Uwe Kern, loaded by \textsf{exesheet}), 
+% for instance: \\ |\definecolor{pointscolor}{named}{blue}|.
+%
+% 
+% \section{Enumerations and lists}
+%
+% \subsection{List settings (nosetlist package option)} \label{par:nosetlist}
+% Enumeration lists are intended to represent questions and sub-questions
+% inside exercises. For a good highlight,
+% labels are typeset in bold. 
+% Moreover, they are left aligned, at the start of the line, 
+% without indentation, and the vertical space between items
+% is increased compared with \LaTeX\ standard lists.
+% These settings are done by the |\setlist| command\footnote{Labels
+% may also be changed by the \texttt{\bs labelenumi} and \texttt{\bs labelenumii} commands.}
+% from the \textsf{enumitem} package by Javier Bezos.
+% Lists with \texttt{itemize} environment are kept in their default configuration\footnote{The
+% \texttt{french} otion of the \textsf{babel} package
+% alters \texttt{itemize} lists behavior and uses long dash
+% as labels for each list level.
+% This behavior is problematic when mathematics follows the dash
+% symbol because the latter may be confused wih the minus sign.
+% Modifications of the \texttt{french} option (which supersedes \texttt{frenchb} 
+% of \textsf{babel}) are canceled to restore \LaTeX\ default settings.}.
+%
+% \vspace{-\baselineskip}
+% \noindent\psframe(-0.25,-0.35)(12.75,-3.9) 
+% \exercise
+% \begin{enumerate}
+% \item First question
+% \begin{enumerate}
+% \item First sub-question
+% \item Second sub-question
+% \end{enumerate}
+% \item Second question
+% \end{enumerate}
+%
+% \DescribeMacro{nosetlist}
+% We can avoid enumeration list modifications and restore the \LaTeX\ default settings by passing the option
+% \texttt{nosetlist} to the \texttt{exesheet} class or package.
+%
+% \subsection{List of exercises : the \texttt{exenumerate} environment}
+% \DescribeEnv{exenumerate}
+% When an exercise sheet is made of short independant exercises,
+% it would be ill-advised to display the complete title \emph{\exercisename} for each. 
+% In addition to the |\exe| command, previously presented,
+% we provide an even lighter solution with the |exenumerate| environment, which is only an enumeration list in which
+% spaces between items are further increased compared with those of \texttt{enumerate}.
+% Here is an example (the main list is an \texttt{exenumerate} environment but 
+% sublists are produced with regular \texttt{enumerate} environments):
+%
+% \vspace{-\baselineskip}
+% \noindent\psframe(-0.25,-0.3)(12.75,-7.05) 
+% \begin{exenumerate}
+% \item Translate the following sentences in english: 
+% \begin{enumerate}
+% \item Nam dui ligula, fringilla a, euismod sodales, sollicitudin vel, wisi.
+% \item Nam lacus libero, pretium at, lobortis vitae, ultricies et, tellus.
+% \end{enumerate}
+% \item  Translate the following sentence in german:
+% \par Donec aliquet, tortor sed accumsan bibendum, erat ligula aliquet magna,
+% vitae ornare odio metus a mi. 
+% \item  Translate the following sentences in french: 
+% \begin{enumerate}
+% \item Cum sociis natoque penatibus 
+% et magnis dis parturient montes, nascetur ridiculus mus.
+% \item Nulla ullamcorper vestibulum turpis.
+% \end{enumerate}
+% \end{exenumerate}
+% The environment takes an optional parameter, like \texttt{enumerate}, which enables, among others, 
+% to typeset alternative list labels, e.g.
+% |\begin{exenumerate}[A.]|.
+% There are many other options (see the \textsf{enumitem} package documentation).
+%
+% \subsection{Items aligned by lines: \texttt{tablenum}}
+% \DescribeEnv{tablenum} 
+% \DescribeEnv{tablenuma}
+% \DescribeEnv{tablitem}
+% These three environments are used to typeset short questions (\texttt{tablenum}),
+% sub-questions (\texttt{tablenuma}) or \texttt{itemize} lists (\texttt{tablitem})
+% on the same line. They have the same syntax:
+% |\begin{tablenum}|\oarg{opt}|(|\meta{cols}|)|.
+% The \meta{cols} parameter is the number of columns used by the environment. It must be
+% \emph{in parentheses}. This parameter can be omitted, then its value is 2.
+% As for classic lists, each item begins with the |\item| command.
+%
+% These three environments are defined by the
+% |\NewTasks| macro, from the \textsf{tasks} package by Clemens Niederberger.
+% They take an optional argument \meta{opt}
+% explained in the documentation of this package, 
+% e.g.\ |counter-format=tsk[r])| gives a roman numbering
+% following by a closing parenthesis.
+% There are also many possibilities to place items in an original way,
+% for instance, the |\item*| command allows to
+% specify the number of columns the item is supposed to span.
+% In the following example,
+% the five |\item| are placed in order between
+% |\begin{tablenum}(3)| and |\end{tablenum}|.
+% Notice that numbering is made line by line.
+%
+% \exercise
+% \psframe(-0.25,1.3)(12.75,-2.7)
+% Give the derivative of the following functions:
+% \begin{tablenum}(3)
+% \item $\ds f(x) = \frac{1-x^2}{\mathrm{e}^x +\mathrm{e}^{-x}}$,
+% \item $\ds g(x) = \ln \left( \frac{1-x}{1+x^2}\right)$,
+% \item $\ds h(x) = \int_{0}^{1}\mathrm{e}^{xy}\, \mathrm{d}y$,
+% \item $\ds k(x) = \sum_{i=1}^{\infty}\frac{1}{x^i}$,
+% \item $\ds l(x) = \int_{\frac{1}{x}}^{x}\frac{1}{\ln t}\, \mathrm{d}t$.
+% \end{tablenum}
+%
+% For \texttt{tablenuma}, labels are
+% letters (a, b, c, \ldots) surrounded
+% by parentheses. This cannot be modified globally
+% (except by redefining the environment with |\RenewTasks|).
+% If the \textsf{exesheet} package is called with option \texttt{nosetlist},
+% labels of \texttt{tablenum} and \texttt{tablenuma} environments
+% are displayed in normal font with indentation, as for
+% \texttt{enumerate}. 
+%
+% \subsection{Items aligned by columns: \texttt{colsenum}}
+% \DescribeEnv{colsenum}    
+% To get numbering of items by columns, we have the
+% \texttt{colsenum} environment: |\begin{colsenum}|\oarg{opt}\marg{cols}.
+% The mandatory parameter is the number of columns
+% and the optional one will be passed to \texttt{enumerate},
+% allowing, for example, to change the type of numbering (a, A, etc.).
+% To use this environment, we have to load the
+% \textsf{multicol} package in the preamble.
+%
+% \exercise
+% \psframe(-0.25,1.3)(12.75,-2.65)
+% Give the derivative of the following functions:
+% \begin{colsenum}{3}
+% \item $\ds f(x) = \frac{1-x^2}{\mathrm{e}^x +\mathrm{e}^{-x}}$,
+% \item $\ds g(x) = \ln \left( \frac{1-x}{1+x^2}\right)$,
+% \item $\ds h(x) = \int_{0}^{1}\mathrm{e}^{xy}\, \mathrm{d}y$,
+% \item $\ds k(x) = \sum_{i=1}^{\infty}\frac{1}{x^i}$,
+% \item $\ds l(x) = \int_{\frac{1}{x}}^{x}\frac{1}{\ln t}\, \mathrm{d}t$.
+% \end{colsenum}
+% \DescribeEnv{colsenum*}
+% We will notice that, on each line, items are not necessarily well
+% aligned, what can produce inelegant effects. 
+% On the other hand, the \texttt{colsenum} environment doesn't try to align columns 
+% from the bottom by adjusting space between items.
+% If we want to get this
+% (which is the default option in \textsf{multicol}) we have the
+% \texttt{colsenum*} environment (same syntax than \texttt{colsenum}).
+% Here what we get in that case, with the same exercise.
+%
+% \exercise
+% \psframe(-0.25,1.3)(12.75,-2.65)
+% Give the derivative of the following functions:
+% \begin{colsenum*}{3}
+% \item $\ds f(x) = \frac{1-x^2}{\mathrm{e}^x +\mathrm{e}^{-x}}$,
+% \item $\ds g(x) = \ln \left( \frac{1-x}{1+x^2}\right)$,
+% \item $\ds h(x) = \int_{0}^{1}\mathrm{e}^{xy}\, \mathrm{d}y$,
+% \item $\ds k(x) = \sum_{i=1}^{\infty}\frac{1}{x^i}$,
+% \item $\ds l(x) = \int_{\frac{1}{x}}^{x}\frac{1}{\ln t}\, \mathrm{d}t$.
+% \end{colsenum*}
+% We can see that these alignments are less good than those
+% obtained by numbering of items by line. The numbering of items by columns
+% may nevertheless be preferable when there are many items with variable heights,
+% and a number of items which can be different from one column to the other.
+% Moreover, an advantage of \texttt{colsenum} is that the choice of labels 
+% is automatic depending on the list level (and the language),
+% unlike \texttt{tablenum} or \texttt{tablenuma}. 
+%
+% \DescribeEnv{colsitem} 
+% \DescribeEnv{colsitem*}
+% For \texttt{itemize} lists, the environment \texttt{colsitem}
+% produces items aligned by columns rather than by lines as for
+% \texttt{tablitem}:
+% |\begin{colsitem}|\oarg{opt}\marg{cols}. The optional parameter,
+% which is passed to the underlying \texttt{itemize} environment, allows to change the item label (bullet by default).
+% And, as for \texttt{colsenum*}, the \texttt{colsitem*} environment
+% produces an alignment of columns from the bottom.
+%
+% \section{Questions and solutions}
+%
+% \subsection{The \texttt{questions} and \texttt{answers} environments}
+% \DescribeEnv{questions} \DescribeEnv{answers}
+% The package provides the two environments \texttt{questions} and \texttt{answers}
+% to make appear or disappear questions and answers of exercises.
+% Display is controlled by two booleans: \texttt{questions} and \texttt{answers}.
+% Their default value is \texttt{true}.
+%
+% \DescribeMacro{\questionsonly} \DescribeMacro{\answersonly}
+% The |\questionsonly| command allows to display the questions without the answers
+% and |\answersonly| displays the solutions without the questions\footnote{Of course 
+% we can also assign the booleans \texttt{questions} and \texttt{answers} 
+% directly with the \LaTeX\ command \texttt{\bs setboolean}.}.
+% 
+% \bigskip
+% \DescribeMacro{\correctionstyle} \DescribeMacro{correctioncolor}
+% \DescribeMacro{\correctionname}
+% In the case (by default) where questions and answers are displayed both,
+% answers are then typeset in the style
+% |\correctionstyle|, which uses the color \texttt{correctioncolor}.
+% This color may be choosen with the |\definecolor| macro
+% (by default |\definecolor{correctioncolor}{rgb}{0,0.2,0.6}| = kind of dark blue).
+% Moreover, in that case,
+% the title \textbf{\correctionname} is displayed at the beginning
+% of the \texttt{answers} environment.
+% It is defined by the |\correctionname| macro (with translation in a few languages
+% and that we can change:\footnote{Except for English, if you want to change package keywords you have to do it \emph{after} \texttt{\bs begin\{document\}}
+% because \textsf{babel} will modify these definitions at the end of the preamble.}
+% for example we may prefer \emph{Solution}
+% than \emph{\correctionname}).
+% The style defined by |\correctionstyle| will apply to the title
+% but also to the whole environment.
+% Here an example.
+%
+% \vspace{-\baselineskip}
+% \noindent\psframe(-0.25,-0.25)(12.75,-6.6) 
+% \exercise[\points{3}] \label{points}
+% \begin{questions}
+% \begin{enumerate}
+% \item Is the \textsf{exesheet} package useful ? 
+% \item Ins't there any other packages that deal with exercises ?
+% \end{enumerate}
+% \end{questions}
+% \begin{answers}
+% \begin{enumerate}
+% \item Yes, the \textsf{exesheet} package is very useful.
+% \item There are many other packages that deal with exercices, and
+% give the ability to produce separatly questions and solutions, for example
+% \textsf{exercise} by Paul Pichaureau, \textsf{exercises} by Roger Jud,
+% \textsf{exsheets} (superseded by \textsf{xsim}) by Clemens Niederberger,
+% \textsf{exframe} by Niklas Beisert,
+% \textsf{exam} by Philip Hirschhorn,
+% \textsf{answers} by Mike Piff and Joseph Wright,
+% \textsf{probsoln} by Nicola Talbot, etc.
+% \end{enumerate}
+% \end{answers}
+%
+% \DescribeMacro{\points}
+% When only answers are displayed, the text color remains black,
+% the word \emph{\correctionname} is not displayed and the
+% |\points| macro is patched to suppress the display of points.
+% An extended solution for a variable display of points will be disussed
+% in section \ref{totalpoints} with the |\totalpoints| macro.
+%
+% \subsection{More about \texttt{answers} environment}
+% Internally, we have used the |\comment| and |\endcomment| macros
+% from the \textsf{versions} package by Uwe Lück.
+% Other excellent packages allow to manage
+% selectively piece of code. Let us mention 
+% \textsf{verbatim} by Rainer Schöpf, \textsf{comment} by Victor Eijkhout, 
+% \textsf{version} by Donald Arseneau and Stephen Bellantoni,
+% \textsf{optional} by Donald Arseneau
+% and \textsf{codesection} by Matthias Pospiech.
+%
+% The \textsf{versions} package used provides furthermore 
+% the |\includeversion|\marg{env} and
+% |\excludeversion|\marg{env} macros who allow to make appear or disappear
+% any environment \meta{env} and these optional environments
+% may be nested\footnote{The \textsf{codesection} package also allows
+% such nesting, including in the preamble,
+% as well as the \textsf{optional} package, but the latter only manages short optional code.}.
+%
+% However the \texttt{questions} and \texttt{answers} environments
+% perform another task, not only making appear or disappear piece of text.
+% Indeed, there is a problem with the title \emph{\correctionname}. 
+% In which format to typeset it and at which level to put it in the table of contents
+% (or in the summary of the pdf file)?
+% In fact it depends on which level the environment has been nested.
+% We can make a single \texttt{answers} environment for all the
+% exercises of the sheet or an \texttt{answers} environment
+% for each exercise, for each exercise part, for each question or sub-question.
+% In fact, the typeset of the title \emph{\correctionname}
+% and his level in the table of contents will be adjusted automatically.
+%
+% \DescribeEnv{\oarg{level}}
+% Nevertheless, we can imagine twisted situations in which 
+% the title level will not be correctly calculated.
+% It is then possible to force the level of the title \emph{\correctionname} 
+% with |\begin{answers}|\oarg{level}.
+% The optional \meta{level} parameter is defined as follows:
+% 1 for section level titles,
+% 2 for subsections (like \emph{\exercisename}), 
+% 3 for subsubsections (like \emph{\partname}),
+% another number for lower levels
+% (then they will not appear in the table of contents).
+%
+% \bigskip
+% \DescribeMacro{answers*}
+% The starred version \texttt{answers*} allows to make the title
+% \textbf{\correctionname} completely disappear.
+%
+% \subsection{The \texttt{\bs question} command}
+% \DescribeMacro{\question}
+% Instead of the \texttt{questions} and \texttt{answers} environments,
+% we can also use the simple |\question|\marg{ques}\marg{ans} macro
+% in which display of \meta{ques} and \meta{ans} arguments 
+% is controlled by the same previous commands |\questionsonly| and |\answersonly|.
+% It can be more readable (in the source code) when questions and answers are short.
+% In the case of displaying both questions and answers,
+% the \emph{\correctionname} title will appear on a new line, in bold,
+% as for levels lower than subsubsection in the \texttt{answers} environment
+% (and without entries in the table of contents).
+% But this command doesn't work with \texttt{verbatim} inside.
+%
+% \section{Marginal notes for marking scheme}
+%
+% The \textsf{exesheet} package allows the display of a marking
+% scheme with comments and explanations for answers.
+%
+% \pagebreak
+% \subsection{The \texttt{\bs pts} command}
+% \DescribeMacro{\pts}
+% When exercises are typeset with the |\exe| macro,
+% or as a list with the \texttt{exenumerate} environment,
+% the marking scheme is displayed in the margin, on the line where
+% we put the |\pts|\marg{num} command (in general the first line of the exercise).
+% The \meta{num} parameter is the number of points assigned to the exercise.
+%
+% \vspace{-\baselineskip}
+% \noindent\psframe(-3.5,-0.25)(12.75,-2)
+% \exe \pts{3} The first exercise with marking sheme.
+% \exe \pts{1.5} The second one.
+% 
+% \bigskip
+% \DescribeMacro{\ptsname} \DescribeMacro{\ptname} 
+% \DescribeMacro{ptscolor} \DescribeMacro{\ptsstyle}
+% The abbreviation \textsf{\ptsname} (or \textsf{\ptname} 
+% when the number of points is inferior to 2)
+% is automatically added thanks to the macro |\ptsname| or |\ptname| 
+% (translated in a few languages if \textsf{babel} is loaded).
+% The display color of the points is defined by \texttt{ptscolor} which can be changed
+% with |\definecolor|: by default |\definecolor{ptscolor}{named}{red}|.
+% The display style is defined by |\ptsstyle|.
+%
+% \DescribeMacro{\displaypts}
+% The display of the marking scheme, as above, is internally controlled by the
+% \texttt{marginpts} boolean.
+% The |\displaypts| command, which has to be placed in the preamble, defines \texttt{marginpts} to \texttt{true},
+% places marginal notes to the left (and not to the right which 
+% is the default behavior of \LaTeX)
+% and shifts the text body right to increase the left margin compared 
+% with the right one, with a ratio 3:2,
+% as it is in the present document.
+% This ratio is defined by the
+% |geometry| macro from the \textsf{geometry} package (by Hideo Umeki) and is valid for the whole document.
+% 
+% \subsection{The \texttt{\bs totalexe}, \texttt{\bs note} and \texttt{\bs totalpoints} commands}
+% \label{totalpoints}
+% \DescribeMacro{\totalexe}
+% \DescribeMacro{\note}
+% To give a more detailed marking sheme, the \textsf{exesheet} package 
+% provides some extended commands:
+% |\totalexe|\marg{num} to display the total number of points of an exercise
+% and especially |\note|\oarg{pts}\marg{comment},
+% to indicate some marking detail in answers.
+% The optional parameter \meta{pts} is the number of points of the question
+% and the mandatory parameter \meta{comment} is used to give details about the marking scheme.
+% Below the title has been obtained with |\exercise[\totalexe{4}]|
+% and the first comment with \\
+% |\note[1]{0,5 for the anti-derivative\\0,5 for simplification of $\ln$}|.
+%
+% \exercise[\totalexe{4}] \label{totalexe}
+% \begin{questions}
+% \psframe(-3.5,1.3)(12.75,-3.1)
+% For each following question, say if the assertion is true or false.
+% Justify the answer carefully.
+% \begin{tablenum}
+% \item $\ds \int_{0}^{\sqrt{3}}\frac{1}{x+\sqrt{3}} \,\mathrm{d}x = \ln 2$,
+% \item $\ds \int_{2}^{\mathrm{e}} \frac{1}{x\ln x} \,\mathrm{d}x = -\ln 2$,
+% \item* The function $F$ defined on $\mathbf{R}$ by 
+% $F(x) = \ds \int_{0}^{x}\frac{1}{,t^2+t+1}\,\mathrm{d} t$, is increasing on $\mathbf{R}$.
+% \end{tablenum}
+% \end{questions}
+% 
+% \begin{answers}
+% \vspace{-\baselineskip}
+% \noindent\psframe(-4.7,0.9)(12.75,-10.25)
+% \begin{enumerate}
+%    \item \note[1]{0,5 for the anti-derivative\\0,5 for simplification of $\ln$}
+%    We calculate:
+%    \[ \int_{0}^{\sqrt{3}}\frac{1}{x+\sqrt{3}}\,\mathrm{d}x
+%        = \bigg[ \ln\left(x+\sqrt{3}\right) \bigg]_0^{\sqrt{3}}
+%        = \ln\left(2\sqrt{3}\right)-\ln \sqrt{3}
+%        = \ln\left(\frac{2 \sqrt{3}}{\sqrt{3}}\right)
+%        =\ln 2.
+%    \]
+%    \textbf{TRUE}.
+%
+%    \item \note[1.5]{1 for the anti-derivative \\0.5 for the integral value \\[2ex]
+%        we could also see that $\frac{1}{x \ln x} >0$ on $[2, \mathrm{e}]$ 
+%       while $-\ln2<0$
+%    }
+%    We have $\ds\frac{1}{x \ln x}= \frac{\frac{1}{x}}{\ln x}= \frac{u'(x)}{u(x)}$
+%    with $u(x)=\ln x$, which is positive on $[2, \mathrm{e}]$. Hence
+%
+%    \[ \int_{2}^{\mathrm{e}}\frac{1}{x \ln x}\,\mathrm{d}x
+%        = \Big[ \ln(\ln x) \Big]_2^\mathrm{e}
+%        = \ln(\ln \mathrm{e})-\ln(\ln2)= \ln1 -\ln(\ln2)=-\ln(\ln2).
+%    \]
+%    \textbf{FALSE}.
+%
+%    \item \note*{1.5}
+%    The function $F$ defined on $\mathbf{R}$ by
+%    \[ F(x)= \int_{0}^{x}\frac{1}{t^2+t+1}\, \mathrm{d}t \]
+%    is derivable on $\mathbf{R}$ and its derivative is such that
+%    $F'(x)=\frac{1}{x^2+x+1}$.
+%    \note{0.5 for $F'$\\1 for the sign of $F'$ and conclusion}
+%    The denominator is a quadratic polynomial, always positive because its discriminant is
+%    $\Delta=-3 <0$.
+%    Thus $F$ is increasing on $\mathbf{R}$. \\
+%    \textbf{TRUE}.
+% \end{enumerate}
+% \end{answers}
+% In the comment of answer 2, a wider vertical space is produced at line break
+% with the optional argument |\\[2ex]|\footnote{When a marginal note at the end of a page,
+% is followed by another one at the top of the next page,
+% the latter is shifted down.
+% We can raise this note, by adding at the line break
+% a negative vertical space : \texttt{\bs note*\{\bs\bs[-5ex] 2\}}.}.
+% The last comment, not placed beside the number of points of answer 3,
+% has been produced by placing on the first line after the formula:
+% |\note{0.5 for $F'$\\1 for the sign of $F'$ and conclusion}|.
+%
+% \DescribeMacro{\note*}
+% If we don't want to add comment, we have the
+% |\note*|\marg{pts} command (better thant |\note|\oarg{pts}|{}|),
+% used here in answer 3: |\note*{1.5}|.
+%
+% \DescribeMacro{markingcolor} \DescribeMacro{\markingstyle} \DescribeMacro{\ptsboxlength}
+% The display color of the points, in |\totalexe| and |\note|,
+% is defined by \texttt{markingcolor}
+% and the style by |\markingstyle|, which are modifiables.
+% The oval box produced by |\totalexe| is obtained with the |\ovalbox| command
+% of the \textsf{fancybox} package by Timothy Van Zandt,
+% with corner arcs set by |\cornersize{1}|.
+% The box length is not adjusted to content but depends of the value
+% of |\ptsboxlength| in order to keep a uniform appearance
+% from one exercise to the other.
+%
+% \DescribeMacro{notecolor} \DescribeMacro{\notestyle} \DescribeMacro{\noteragged}
+% Comment notes are typeset by default in a dark green color
+% defined by |\definecolor{notecolor}{rgb}{0.0,0.4,0.0}|.
+% The style of the comment is set by the |\notestyle| macro and itself uses the
+% |\noteragged| macro. The latter is set by default as |\raggedleft|
+% to obtain a \emph{right} alignment (what is customary for notes
+% in the left margin).
+% 
+% \DescribeMacro{\displaypoints}
+% Display of points and comments is optional. It is internally controlled by the booleans
+% \texttt{marginpoints} and \texttt{marginfullnotes}.
+% The |\displaypoints| macro, to place in the preamble, sets  \texttt{marginpoints}
+% to \texttt{true}, chooses the left margin for display marginal notes
+% and sets the ratio between left and right margins to 3:2\footnote{So 
+% that the effect on the margin ratio is correct, the
+% \texttt{\bs displaypoints} macro must be placed after other commands that could alter the page geometry, for example the \texttt{\bs pagestyle}
+% of the \textsf{schooldocs} package.}.
+% Points will then be displayed without the comments.
+% 
+% \DescribeMacro{\displaynotes} 
+% The |\displaynotes|\oarg{align} macro, to be placed also in the preamble,
+% defines both booleans to \texttt{true} and allows then the complete display of points and comments.
+% The ratio between left/right margins is then set to 5/1\footnote{The
+% present document kept a ratio of 3/2 because 
+% the \textsf{ltxdoc} class, used here, leaves large enough margins
+% and previous examples are not concerned with display of comments.}.
+% The optional parameter \meta{align} is used to define alignment:
+% |\raggedleft| by default, but we could use |\centering| or
+% |\raggedright| (not recommended in left margin).
+%
+% \DescribeMacro{\displaynotesright}
+% The |\displaynotesright|\oarg{align} macro displays a detailed marking scheme
+% with comments in the right margin, with the same type of settings 
+% as |\displaynotes| but an optional parameter \meta{align} set by default
+% to |\raggedleft|.
+%
+% \bigskip
+% \DescribeMacro{\totalpoints}
+% The |\totalpoints|\marg{num} macro is intended
+% to replace |\points| when using a detailed marking scheme.
+% When the scale is not displayed (\texttt{marginpoints} boolean to \texttt{false}),
+% it uses |\points| and when the scale is displayed,
+% it uses |\totalexe|.
+% For example, in the exercise \ref{totalexe}, we should use
+% |\totalpoints| rather than |\totalexe|,
+% because, when the detailed marking scheme is not displayed, the total points will be typeset
+% as in the exercise \ref{points} rather than in the margin.
+%
+%
+%
+% \StopEventually{}
+%
+% \section{Implementation}
+%
+% \subsection{Class and package basic instructions}
+% The \texttt{exesheet} class is based on the \texttt{article} class
+% and gives it all its options, except explicit options 
+% \texttt{notoc} and \texttt{nosetlist}.
+%
+%    \begin{macrocode}
+%<*class>
+\DeclareOption{notoc}{\PassOptionsToPackage{notoc}{exesheet}}
+\DeclareOption{nosetlist}{\PassOptionsToPackage{nosetlist}{exesheet}}
+\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
+\ProcessOptions \relax
+\LoadClass{article}
+\RequirePackage{exesheet}
+\RequirePackage{schooldocs}
+%</class>
+%    \end{macrocode}
+%
+% Then we define initialization instructions of the \textsf{exesheet} package.
+%
+% \medskip
+%  The \texttt{shortlabel} option in the \textsf{enumitem} package allows to use labels like in 
+% the \textsf{enumerate} package e.g. 1., a), A. etc.
+%
+%    \begin{macrocode}
+%<*package>
+\RequirePackage{ifthen}
+\newboolean{notoc}
+\newboolean{nosetlist}
+\DeclareOption{notoc}{\setboolean{notoc}{true}}
+\DeclareOption{nosetlist}{\setboolean{nosetlist}{true}}
+\ProcessOptions \relax
+\RequirePackage{xcolor}
+\RequirePackage[shortlabels]{enumitem} 
+\RequirePackage{tasks}
+\RequirePackage{versions}
+%\@ifpackageloaded{doc}{}{\RequirePackage{verbatim}}
+\RequirePackage{geometry}
+\RequirePackage{fancybox}
+
+%    \end{macrocode}
+%
+% \subsection{Internationalization}
+% Here we define the keywords and their translation in French, German, Spanish
+% Italian, Portuguese, thanks to the |\addto\captions|\meta{language} macro
+% of the \textsf{babel} package.
+%
+% Translations are placed in a macro |\exetranslate| because, if
+% \textsf{exesheet} is called before \textsf{babel} (this is necessarily the case for the 
+% \textsf{exesheet} class), then these translations should only happen
+% after having loaded the \textsf{babel} package, therefore the |\AtBeginDocument|.
+% On the other hand, if the package is loaded \emph{after} \textsf{babel},
+% |AtBeginDocument{\exetranslate}| doesn't work, curiously.
+% But calling immediately |\exetranslate| works in that case.
+%
+% Accented characters cannot be used here because they are not recognized 
+% if \textsf{inputenc} is loaded after \textsf{exesheet},
+% despite the |\AtBeginDocument|. So we have used the basic \LaTeX\ commands to produce them.
+%
+% \TODO: give the choice to use \textsf{polyglossia} instead of \textsf{babel};
+% see the \textsf{translations} or \textsf{multilang} packages.
+%
+%    \begin{macrocode}
+\def\exercisename{Exercise}
+\def\subpartname{Part}
+\def\annexname{Annex}
+\def\exname{Ex}
+\def\pointsname{points}    
+\def\pointname{point}
+\def\correctionname{Correction}
+\def\ptsname{pts}
+\def\ptname{pt}
+
+\newcommand\exetranslate{%
+    \@ifpackageloaded{babel}{%
+        \addto\captionsfrench{%
+            \def\exercisename{Exercice}
+            \def\subpartname{Partie}
+            \def\annexname{Annexe}
+            \def\exname{Ex}
+            \def\pointsname{points}
+            \def\pointname{point}
+            \def\correctionname{Correction}
+            \def\ptsname{pts}
+            \def\ptname{pt}
+            }
+        \addto\captionsgerman{%
+            \def\exercisename{\"Ubung}
+            \def\subpartname{Teil}
+            \def\annexname{Anhang}
+            \def\exname{\"Ub}
+            \def\pointsname{Punkte}
+            \def\pointname{Punkt}
+            \def\correctionname{Verbesserung}
+            \def\ptsname{Pkte}
+            \def\ptname{Pkt}
+            }
+        \addto\captionsspanish{%
+            \def\exercisename{Ejercicio}
+            \def\subpartname{Parte}
+            \def\annexname{Anexo}
+            \def\exname{Ej}
+            \def\pointsname{puntos}
+            \def\pointname{punto}
+            \def\correctionname{Correcci\'on}
+            \def\ptsname{ptos}
+            \def\ptname{pot}
+            }
+        \addto\captionsitalian{%
+            \def\exercisename{Esercizio}
+            \def\subpartname{Parte}
+            \def\annexname{Ansesso}
+            \def\exname{Es}
+            \def\pointsname{punti}
+            \def\pointname{punto}
+            \def\correctionname{Correzione}
+            \def\ptsname{pti}
+            \def\ptname{pt}
+            }
+        \addto\captionsportuges{%
+            \def\exercisename{Exerc\'icio}
+            \def\subpartname{Parte}
+            \def\annexname{Anexo}
+            \def\exname{Ex}
+            \def\pointsname{pontos}
+            \def\pointname{ponto}
+            \def\correctionname{Corre\c c\~ao}
+            \def\ptsname{pts}
+            \def\ptname{pt}
+            }
+        }{}
+    }
+
+\AtBeginDocument{\exetranslate} % if loaded before babel
+\exetranslate % necessary when loaded after babel
+
+%    \end{macrocode}
+%
+% \subsection{Colors}
+% The color \texttt{pointscolor} is used by the macro |\points| 
+% and \texttt{markingcolor} by the macros |\totalexe|, |\note*| 
+% and also for the optional argument of |\note|;
+% \texttt{notecolor} is used by the mandatory argument of |\note|.
+%
+%    \begin{macrocode}
+\definecolor{pointscolor}{named}{red}
+\definecolor{ptscolor}{named}{red}
+\definecolor{markingcolor}{named}{red}
+\definecolor{notecolor}{rgb}{0.0, 0.4, 0.0} % kind of dark green
+\definecolor{correctioncolor}{rgb}{0,0.2,0.6} % kind of dark blue
+
+%    \end{macrocode}
+%
+% \medskip
+% \subsection{Titles}
+% The \texttt{exercise} counter numbers exercises for the whole document 
+% regardless of any section.
+% To reset the counter at some point, just write |\setcounter{exercise}{0}|
+% and if we want an automatic reset at each section,
+% add in the preamble \\
+% |\makeatletter \@addtoreset{exercise}{section} \makeatother|.
+%
+% The parts counter depends on \texttt{exercise} and is reset
+% at each new exercise.
+%
+% The |\labelexercisestyle| and |\labelsubpartstyle| commands
+% are empty, but allow to customize the style, for instance:\\
+% |\renewcommand\labelexercisestyle{\sffamily}|.
+%
+% By default, the table of contents displays the titles of exercises and parts.
+% The \texttt{notoc} boolean is used to modify this behavior.
+% If we want to display only exercise titles but not parts,
+% we can place in the preamble |\setcounter{tocdepth}{2}|.
+%
+% \begin{macro}{\exercise}
+%    \begin{macrocode}
+\newcounter{exercise}
+
+\newcommand{\labelexercise}{\exercisename~\theexercise}
+\newcommand{\labelexercisestyle}{}
+\newcommand*{\@exercise}[1][]{%     
+    \refstepcounter{exercise}
+    \subsection*{\labelexercisestyle\labelexercise\ #1}
+    \ifthenelse{\boolean{notoc}}{}{
+        \addcontentsline{toc}{subsection}{\labelexercise}
+        }
+    }
+\newcommand*{\@@exercise}[2][]{%
+    \subsection*{\labelexercisestyle #2 #1}        
+    \setcounter{subpart}{0} % resets the parts counter
+    \ifthenelse{\boolean{notoc}}{}{
+        \addcontentsline{toc}{subsection}{#2}
+        }
+    }
+\newcommand{\exercise}{\@ifstar{\@@exercise}{\@exercise}}    
+
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\subpart}
+%    \begin{macrocode}
+\newcounter{subpart}[exercise] %
+\renewcommand{\thesubpart}{\Alph{subpart}}
+
+\newcommand{\labelsubpart}{\subpartname~\thesubpart}
+\newcommand{\labelsubpartstyle}{}
+\newcommand*{\@subpart}[1][]{%
+    \refstepcounter{subpart}%    
+    \subsubsection*{\labelsubpartstyle\labelsubpart\ #1}
+    \ifthenelse{\boolean{notoc}}{}{
+        \addcontentsline{toc}{subsubsection}{\labelsubpart}
+        }
+    }
+\newcommand*{\@@subpart}[2][]{%
+    \subsubsection*{\labelsubpartstyle #2 #1}
+    \ifthenelse{\boolean{notoc}}{}{
+        \addcontentsline{toc}{subsubsection}{#2}
+        }
+    }
+\newcommand{\subpart}{\@ifstar{\@@subpart}{\@subpart}}
+
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\annex}
+%    \begin{macrocode}
+\newcommand{\annexstyle}{\MakeUppercase}
+\newcommand*{\annex}[1][]{%
+    \subsection*{\mbox{}\hfill\annexstyle{\annexname} #1\hfill\mbox{}}
+    \ifthenelse{\boolean{notoc}}{}{
+        \addcontentsline{toc}{subsection}{\annexname}
+        }
+    }    
+
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\exe}
+%    \begin{macrocode}
+\newcommand{\exlabel}{\exname.~\theexercise}
+\newcommand{\exsepmark}{---}
+\newcommand{\@exe}{\textbf{\exlabel~\exsepmark}~}
+\newcommand{\@@exe}{\textbf{\exlabel}~}
+\newcommand{\exe}{\bigskip\par\noindent\refstepcounter{exercise}
+    \@ifstar{\@@exe}{\@exe}
+    }
+
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\points (ini)}
+%    \begin{macrocode}    
+\newcommand{\pointsstyle}{%
+    \small\mdseries\sffamily\color{pointscolor}\fbox}
+\newcommand*{\points}[1]{\hfill 
+    \pointsstyle{#1~%
+        \ifthenelse{\lengthtest{#1 cm < 2cm}}{\pointname}{\pointsname}%
+        }
+    }
+   
+%    \end{macrocode}
+% Percent symbols are necessary to avoid spaces between the
+% |\fbox| and its inner text.
+% Note that, without |\lengthtest|, the test |#1 < 2| doesn't work with decimal numbers.
+% % \end{macro}
+%
+% \subsection{Enumerations and lists}
+%
+% When using \textsf{babel} with the \texttt{french} option\footnote{The \texttt{french} option
+% of \textsf{babel} superseeds the \texttt{frenchb} option.},
+% \texttt{itemize} lists are modified with the same dash label for each list level. These modifications are cancelled here to restore default \LaTeX\ \texttt{itemize} lists (labels and spaces).
+% As for |\exetranslate|,
+% we have create the |\standardfrenchlists| command who must be called into
+% |AtBeginDocument| or not, depending on whether
+% \textsf{exesheet} is loaded before \textsf{babel} or after.
+%
+% The |\setlist| command comes from the \textsf{enumitem} package
+% (|\setenumerate| is deprecated). By default |itemsep=1ex| for lists of first level,
+% and |leftmargin=1.5em| allows to align labels on the start of lines.
+%
+%    \begin{macrocode}
+\newcommand\standardfrenchlists{%
+    \@ifpackagewith{babel}{frenchb}{
+        \frenchbsetup{StandardLists=true}}{}
+    \@ifpackagewith{babel}{french}{
+        \@ifundefined{frenchsetup}{
+            \frenchbsetup{StandardLists=true}}{
+            \frenchsetup{StandardLists=True}}
+        }{}
+    }
+\ifthenelse{\boolean{nosetlist}}{}{
+    \AtBeginDocument{% if loaded before babel package
+        \standardfrenchlists}
+    \standardfrenchlists % necessary when loaded after babel
+    \setlist[enumerate]{font=\bfseries}
+    \setlist[enumerate,1]{topsep=1.5ex plus 1ex minus 1ex,leftmargin=1.5em}
+    }
+
+%    \end{macrocode}
+% \begin{macro}{\exenumerate}
+%    \begin{macrocode}
+\newenvironment{exenumerate}[1][]{%
+    \setlist[enumerate]{font=\bfseries}
+    \setlist[enumerate,1]{leftmargin=1.5em,
+        itemsep=3ex plus 1ex minus 1ex,topsep=3ex plus 1ex minus 1ex}
+    \setlist[enumerate,3]{noitemsep,nolistsep}
+    \setlist[itemize]{noitemsep,nolistsep}
+    \begin{enumerate}[#1]
+    }{\end{enumerate}}
+
+%    \end{macrocode}
+% \end{macro}
+% \DescribeEnv{tablenum} \DescribeEnv{tablenuma}
+% The |\NewTasks| command comes from the \textsf{tasks} package.
+% It allows to define the environments \texttt{tablenum}, \texttt{tablenuma}
+% and \texttt{tablitem}.
+% The horizontal spaces are adjusted to get a good alignment with
+% items of other \texttt{enumerate} (or \texttt{itemize}) environments.
+%
+%    \begin{macrocode}
+\ifthenelse{\boolean{nosetlist}}{
+    \NewTasks[counter-format=tsk[1].,
+        column-sep=1em,
+        after-item-skip=0.5ex plus 0.5ex minus 0.5ex]{tablenum}[\item](2)
+    \NewTasks[counter-format=(tsk[a]),
+        column-sep=1em,label-align=right,
+        item-indent=2.15em,label-width=1.6em,label-offset=0.5em,
+        after-item-skip=0.5ex plus 0.5ex minus 0.5ex]{tablenuma}[\item](2)
+    }{% by default
+    \NewTasks[counter-format=tsk[1].,label-format=\bfseries,
+        column-sep=1em,label-align=right,
+        item-indent=1.5em,label-width=1em,label-offset=0.5em,
+        after-item-skip=0.5ex plus 0.5ex minus 0.5ex]{tablenum}[\item](2)
+    \NewTasks[counter-format=(tsk[a]),label-format=\bfseries,
+        column-sep=1em,label-align=right,
+        item-indent=2.15em,label-width=1.6em,label-offset=0.5em,
+        after-item-skip=0.5ex plus 0.5ex minus 0.5ex]{tablenuma}[\item](2)
+    }
+
+%    \end{macrocode}
+% \DescribeEnv{tablitem}
+%    \begin{macrocode}
+\NewTasks[label=\labelitemi,
+    label-align=right,
+    item-indent=2.3333em,label-offset=0.5em,
+    after-item-skip=0.5ex plus 0.5ex minus 0.5ex]{tablitem}[\item](2)
+
+%    \end{macrocode}
+% \DescribeEnv{colsenum} \DescribeEnv{colsenum*}
+%    \begin{macrocode}
+\newenvironment{colsenum}[2][]{%
+    \setlength{\multicolsep}{2ex}
+    \raggedcolumns % default is \flushcolumns
+    \begin{multicols}{#2} % #2 = number of columns
+    \begin{enumerate}[#1] % #1 = options of enumerate
+    }{
+    \end{enumerate}
+    \end{multicols}
+}
+
+\newenvironment{colsenum*}[2][]{%
+    \setlength{\multicolsep}{2ex}
+    \begin{multicols}{#2} % #2 = number of columns
+    \begin{enumerate}[#1] % #1 = options of enumerate
+    }{
+    \end{enumerate}
+    \end{multicols}
+}
+
+%    \end{macrocode}
+% \DescribeEnv{colsitem} \DescribeEnv{colsitem*}
+%    \begin{macrocode}
+\newenvironment{colsitem}[2][]{%
+    \setlength{\multicolsep}{2ex}
+    \raggedcolumns
+    \begin{multicols}{#2}
+    \begin{itemize}[#1]
+    }{
+    \end{itemize}
+    \end{multicols}
+}
+
+\newenvironment{colsitem*}[2][]{%
+    \setlength{\multicolsep}{2ex}
+    \begin{multicols}{#2}
+    \begin{itemize}[#1]
+    }{
+    \end{itemize}
+    \end{multicols}
+}
+
+%    \end{macrocode}
+%
+% \subsection{Questions and answers}
+%
+% \DescribeMacro{\questionsonly} \DescribeMacro{\answersonly}
+% The \texttt{questions} and \texttt{answers} booleans
+% control the display of corresponding environments.
+% When created, a boolean has the \texttt{false} value by default,
+% but we define them to \texttt{true}.
+% The |\questionsonly| and |\answersonly| macros are used as user interface
+% to display only one of the two environments.
+%    \begin{macrocode}
+\newboolean{questions}
+\newboolean{answers}
+\setboolean{questions}{true}
+\setboolean{answers}{true}
+\newcommand{\questionsonly}{
+    \setboolean{questions}{true}\setboolean{answers}{false}}
+\newcommand{\answersonly}{
+    \setboolean{questions}{false}\setboolean{answers}{true}}
+
+%    \end{macrocode}
+%
+% \begin{environment}{questions}
+% It is the |\comment| and |\endcomment| macros, provided by the  \textsf{versions} package,
+% that allow the magic of conditional displays (we can also find them in the \textsf{verbatim} or \textsf{version} packages).
+% The noteworthy \textsf{codesection} package, allows to encapsulate 
+% optional code between the macros |\BeginCodeSection|\marg{skip} and |\EndCodeSection|\marg{skip},
+% both in the text body and in the preamble,
+% but these macros cannot be used inside an environment 
+% as we did here for |\comment| and |\endcomment|.
+%    \begin{macrocode}
+\newcounter{exe@ini}
+\newcounter{subpart@ini}
+
+\newenvironment{questions}{
+    \ifthenelse{\boolean{questions}}{
+        \setcounter{exe@ini}{\value{exercise}}
+        \setcounter{subpart@ini}{\value{subpart}}
+        }{\comment}}%
+    {\ifthenelse{\boolean{questions}}{}{\endcomment}}
+
+%    \end{macrocode}
+% \end{environment}
+% \begin{environment}{answers}
+% The internal macro |\set@toclevel| calculates the title level
+% of the word \emph{\correctionname} to display at the start of an
+% \texttt{answers} environment (when \texttt{questions} and \texttt{answers} are
+% displayed together). The principle is to compare the state of the counters
+% \texttt{exercise} and \texttt{subpart} with those saved at the time of
+% the call of \texttt{questions}. The |\@enumdepth| counter indicates the 
+% \texttt{enumerate} list level in which we are (0 = out of lists).
+% The optional parameter of the \texttt{answers} environment allows to force this title level.
+%    \begin{macrocode}
+\newcounter{@toclevel}
+\newcommand{\set@toclevel}[1][]{
+    \ifthenelse{\equal{#1}{}}{
+        \ifthenelse{\value{exercise} > \value{exe@ini}}{
+            \setcounter{@toclevel}{1}
+        }{\ifthenelse{\equal{\the\@enumdepth}{0}}{
+            % we're not in an enumerate environment
+            \ifthenelse{\(\value{subpart} > \value{subpart@ini}\)
+                \or \(\value{subpart} = 0\)}{
+                \setcounter{@toclevel}{2}
+            }{\setcounter{@toclevel}{3}}
+          }{\setcounter{@toclevel}{4}}}
+    }{\setcounter{@toclevel}{#1}}}
+
+\newcommand{\correctionstyle}{\color{correctioncolor}}
+
+\newenvironment{answers}[1][]{% #1 is the optional level
+    \ifthenelse{\boolean{answers}}{%
+        \ifthenelse{\boolean{questions}}{%
+            \set@toclevel[#1]
+            \ifthenelse{\value{@toclevel} = 1}{
+                \section*{\correctionstyle\correctionname}
+                \ifthenelse{\boolean{notoc}}{}{
+                    \addcontentsline{toc}{section}{\correctionname}}
+                \setcounter{exercise}{0}
+            }{\ifthenelse{\value{@toclevel} = 2}{%
+                  \subsection*{\correctionstyle\correctionname}
+                  \ifthenelse{\boolean{notoc}}{}{
+                      \addcontentsline{toc}{subsection}{\correctionname}}
+                  \setcounter{subpart}{0}
+              }{\ifthenelse{\value{@toclevel} = 3}{%
+                    \subsubsection*{\correctionstyle\correctionname}
+                    \ifthenelse{\boolean{notoc}}{}{
+                        \addcontentsline{toc}{subsubsection}{
+                            \correctionname}}
+                    }{\par\textbf{\correctionstyle\correctionname}\par
+                    }%
+              }%
+            }%
+        \correctionstyle%
+        }{}%
+    }{\comment}
+}{\ifthenelse{\boolean{answers}}{}{\endcomment}}
+    
+\newenvironment{answers*}{\ifthenelse{\boolean{answers}}{}{\comment}}%
+    {\ifthenelse{\boolean{answers}}{}{\endcomment}}
+
+%    \end{macrocode}
+% In the \texttt{answers} environment, if we place |\correctionstyle|
+% before |\subsubsection|, the preceding vertical space may be too wide.
+%
+% \end{environment}
+% \begin{macro}{\question}
+%    \begin{macrocode}
+\newcommand{\question}[2]{%
+    \ifthenelse{\boolean{questions}}{#1}{}
+    \bgroup
+    \ifthenelse{\boolean{answers}}{
+        \ifthenelse{\boolean{questions}}{
+            \ifx#2\empty\else
+                \par\correctionstyle\textbf{\correctionname}\par
+            \fi
+            }{}
+        #2}{}
+    \egroup
+    }
+
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\points (patched)}
+%    \begin{macrocode}
+\let\@oldpoints\points
+\renewcommand*{\points}[1]{%
+    \ifthenelse{\boolean{questions}}{\@oldpoints{#1}}{}}
+
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{Marginal notes}
+%
+% The commands |\displaypts|, |\displaypoints| and |\displaynotes|
+% change the ratio between left and right margins\footnote{So 
+% that the effect on the margin ratio is correct, these
+% macros must be called, in the preamble, after other commands that also could alter the page geometry.}.
+%
+% \DescribeMacro{\pts} \DescribeMacro{\displaypts}
+%    \begin{macrocode}
+\newboolean{marginpts}
+\newcommand*{\pointmark}[1]{%
+    \ifthenelse{\lengthtest{#1 cm < 2cm}}{#1 \ptname}{#1 \ptsname}}
+\newcommand{\ptsstyle}[1]{%
+    \footnotesize\centering\sffamily\color{ptscolor} (#1)}
+\newcommand*{\pts}[1]{%
+    \ifthenelse{\boolean{marginpts}}{%
+        \mbox{}% 
+        \marginpar{\hspace{0pt}%
+            \ptsstyle{\pointmark{#1}}}%
+        }{}%
+    \ignorespaces
+    }
+\newcommand{\displaypts}{%
+    \reversemarginpar
+    \geometry{hmarginratio=3:2}
+    \setboolean{marginpts}{true}
+    }
+    
+%    \end{macrocode}
+%
+% \begin{macro}{\totalexe}
+% In the following macros using
+% |\marginpar|, percent symbols and |\ignorespaces| are necessary to avoid too much space in the text (or the margin)
+% where these macros are inserted.
+%    \begin{macrocode}
+\newlength{\ptsboxlength} 
+\setlength{\ptsboxlength}{3.1em}
+\cornersize{1}
+\newcommand*{\totalexe}[1]{% 
+    \ifthenelse{\boolean{marginpoints}}{%
+        \mbox{}%
+        \marginpar{\markingstyle{\ovalbox{%
+            \makebox[\ptsboxlength]{\pointmark{#1}}}%
+            }}%        
+        }{}%
+    \ignorespaces
+    }
+
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\note}
+% The booleans \texttt{marginpoints} and \texttt{marginfullnotes} control
+% the display of marginal notes. If \texttt{marginpoints} is \texttt{false},
+% \texttt{marginfullnotes} will be ignored.
+% The |\noteragged| command is initialized outside |\displaynotes|
+% such that we can use the |\note| command without |\displaynotes| (see further).
+%    \begin{macrocode}
+\newboolean{marginpoints}
+\newboolean{marginfullnotes}
+
+\newcommand{\markingstyle}[1]{\hspace{0pt}\footnotesize\sffamily%
+    \centering\color{markingcolor}\textbf{#1}}
+\newcommand{\noteragged}{\raggedleft}
+\newcommand{\notestyle}[1]{\hspace{0pt}\footnotesize\sffamily%
+    \noteragged\noindent\color{notecolor} #1}
+\newcommand{\@note}[2][]{%
+    \ifthenelse{\boolean{marginpoints}}{%
+        \mbox{}%
+        \marginpar{%
+            \ifthenelse{\equal{#1}{}}{}{\markingstyle{#1}\\}%
+            \ifthenelse{\boolean{marginfullnotes}}{\notestyle #2}{}%
+            }%
+        }{}%
+    \ignorespaces
+    }
+\newcommand{\@@note}[1]{%
+    \ifthenelse{\boolean{marginpoints}}{%
+        \mbox{}%
+        \marginpar{\markingstyle{#1}}%
+        }{}%
+    \ignorespaces
+    }
+\newcommand{\note}{\@ifstar{\@@note}{\@note}}
+
+%    \end{macrocode}
+% \end{macro}
+%
+% \DescribeMacro{\displaypoints} \DescribeMacro{\displaynotes}
+%\DescribeMacro{\displaynotesright}
+% In |\displaynotes|, the additional length \texttt{1\,in} matches 
+% the default free space to the left of |\oddsidemargin|.
+%
+%    \begin{macrocode}
+\newcommand{\displaypoints}{%
+    \reversemarginpar
+    \geometry{hmarginratio=3:2}
+    \setboolean{marginpoints}{true}
+    }
+
+\newcommand*{\displaynotes}[1][\raggedleft]{%
+    \reversemarginpar
+    \renewcommand{\noteragged}{#1}
+    \geometry{hmarginratio=5:1}
+    \setlength{\marginparwidth}{\oddsidemargin}
+    \addtolength{\marginparwidth}{1in}
+    \addtolength{\marginparwidth}{-\marginparsep}
+    \setlength{\marginparwidth}{0.8\marginparwidth}
+    \setboolean{marginpoints}{true}
+    \setboolean{marginfullnotes}{true}
+    }
+    
+\newcommand*{\displaynotesright}[1][\raggedright]{%
+    \normalmarginpar
+    \renewcommand{\noteragged}{#1}
+    \geometry{hmarginratio=1:5}
+    \setlength{\marginparwidth}{\paperwidth}
+    \addtolength{\marginparwidth}{-\textwidth}
+    \addtolength{\marginparwidth}{-\oddsidemargin}
+    \addtolength{\marginparwidth}{-\marginparsep}
+    \addtolength{\marginparwidth}{-1in}
+    \setlength{\marginparwidth}{0.8\marginparwidth}
+    \setboolean{marginpoints}{true}
+    \setboolean{marginfullnotes}{true}
+    }
+%    \end{macrocode}
+% The formatting of marginal notes can possibly be made more regular 
+% with the \textsf{ragged2e} package, not loaded by \textsf{exesheet}.
+% We will then have to enter, as an optional parameter of |\displaypoints|:
+% |\RaggedLeft|, |\Centering|, |\RaggedRight| or |justifying|.
+%
+% \begin{macro}{\totalpoints}
+%    \begin{macrocode}
+\newcommand{\totalpoints}{%
+    \ifthenelse{\boolean{marginpoints}}{\totalexe}{\points}}
+%</package>
+%    \end{macrocode}
+% \end{macro}
+%
+% \Finale
+\endinput
diff --git a/macros/latex/contrib/exesheet/exesheet.ins b/macros/latex/contrib/exesheet/exesheet.ins
new file mode 100644
index 0000000000..37b10a4848
--- /dev/null
+++ b/macros/latex/contrib/exesheet/exesheet.ins
@@ -0,0 +1,56 @@
+%%
+%% Copyright (C) 2020 by Antoine Missier <antoine.missier@ac-toulouse.fr>
+%%
+%% This file 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.
+%%
+
+\input docstrip.tex
+\keepsilent
+
+\usedir{tex/latex/exesheet}
+
+\preamble
+
+This is a generated file.
+
+Copyright (C) 2020 by Antoine Missier <antoine.missier@ac-toulouse.fr>
+
+This file 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.
+
+\endpreamble
+
+\generate{\file{exesheet.cls}{\from{exesheet.dtx}{class}}
+          \file{exesheet.sty}{\from{exesheet.dtx}{package}}}
+
+\obeyspaces
+\Msg{*************************************************************}
+\Msg{*                                                           *}
+\Msg{* To finish the installation you have to move the following *}
+\Msg{* files into a directory searched by TeX:                   *}
+\Msg{*                                                           *}
+\Msg{*     exesheet.cls exesheet.sty                             *}
+\Msg{*                                                           *}
+\Msg{* To produce the documentation run the file exesheet.dtx    *}
+\Msg{* through LaTeX + dvips + ps2pdf                            *}
+\Msg{*                                                           *}
+\Msg{* Happy TeXing!                                             *}
+\Msg{*                                                           *}
+\Msg{*************************************************************}
+
+\endbatchfile
diff --git a/macros/latex/contrib/exesheet/exesheet.pdf b/macros/latex/contrib/exesheet/exesheet.pdf
new file mode 100644
index 0000000000..3783421f5a
--- /dev/null
+++ b/macros/latex/contrib/exesheet/exesheet.pdf
diff --git a/macros/latex/contrib/membranecomputing/README.md b/macros/latex/contrib/membranecomputing/README.md
new file mode 100644
index 0000000000..70a87c6b6a
--- /dev/null
+++ b/macros/latex/contrib/membranecomputing/README.md
@@ -0,0 +1,26 @@
+membranecomputing - a LaTeX package for the Membrane Computing
+community. It comprises the definition of P systems, rules and
+some concepts related to languages and computational
+complexity usually needed for Membrane Computing research.
+
+Written by David Orellana Martín <dorellana@us.es>
+
+No dependencies other than the standards ifthen and xstring packages.
+See membranecomputing.pdf for full documentation
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% Copyright and license
+% =====================
+%
+% Copyright (C) 2020 David Orellana Martín
+%
+% 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.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ No newline at end of file
diff --git a/macros/latex/contrib/membranecomputing/membranecomputing.pdf b/macros/latex/contrib/membranecomputing/membranecomputing.pdf
new file mode 100644
index 0000000000..8fc5b20098
--- /dev/null
+++ b/macros/latex/contrib/membranecomputing/membranecomputing.pdf
diff --git a/macros/latex/contrib/membranecomputing/membranecomputing.sty b/macros/latex/contrib/membranecomputing/membranecomputing.sty
new file mode 100644
index 0000000000..bb513168d5
--- /dev/null
+++ b/macros/latex/contrib/membranecomputing/membranecomputing.sty
@@ -0,0 +1,599 @@
+%%
+%% Copyright 2020 David Orellana Martín
+%
+% 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 David Orellana Martín
+%
+% This work consists of the file membranecomputing.sty.
+
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{membranecomputing}[2020/07/23 Membrane Computing v0.1]
+
+% Require Packages
+
+\RequirePackage{ifthen}
+\RequirePackage{xstring}
+
+% Declare options
+
+\newboolean{membranecomputing@blackboard}
+\setboolean{membranecomputing@blackboard}{false}
+\DeclareOption{blackboard}{
+  \setboolean{membranecomputing@blackboard}{true}
+}
+\DeclareOption{traditional}{
+  \setboolean{membranecomputing@blackboard}{false}
+}
+\ProcessOptions\relax
+
+% Declare counters
+\newcounter{membranecomputing@membrane}
+\newcounter{membranecomputing@imembrane}
+\newcounter{membranecomputing@element}
+
+% Declare auxiliary commands
+
+\newcommand{\membranecomputing@iden}[1]{#1}
+\newcommand{\lhsC}{}
+\newcommand{\rhsC}{}
+\newcommand{\lhsL}{}
+\newcommand{\rhsL}{}
+\newcommand{\lhsP}{}
+\newcommand{\rhsP}{}
+\newcommand{\lhsIC}{}
+\newcommand{\rhsIC}{}
+\newcommand{\lhsIL}{}
+\newcommand{\rhsIL}{}
+\newcommand{\lhsIP}{}
+\newcommand{\rhsIP}{}
+\newcommand{\lhsOC}{}
+\newcommand{\rhsOC}{}
+\newcommand{\lhsE}{}
+\newcommand{\lhsS}{}
+\newcommand{\rhsS}{}
+\newcommand{\rhsD}{}
+
+\newcommand{\arrow}{}
+\newcommand{\labelSub}{}
+\newcommand{\labelSubL}{}
+\newcommand{\labelSubR}{}
+\newcommand{\polW}{}
+\newcommand{\polP}{}
+\newcommand{\polWL}{}
+\newcommand{\polPL}{}
+\newcommand{\polWR}{}
+\newcommand{\polPR}{}
+\newcommand{\formattedRule}{}
+
+\exploregroups \expandarg
+
+\newcommand{\formatRule}[4]{
+  \renewcommand{\arrow}{\ensuremath{\IfStrEq{#1}{written}{\rightarrow}{\, --> \,}}}
+  \IfStrEqCase{#2}
+  {% BEGIN CASES
+    {rewriting}
+    {%BEGIN IF REWRITING
+      \renewcommand{\formattedRule}{#3 \arrow #4}
+    }% END IF REWRITING
+    {single}
+    {% BEGIN IF SINGLE
+      \renewcommand{\formattedRule}{#3 \arrow #4}
+    }% END IF SINGLE
+    {multiple}
+    {% BEGIN IF MULTIPLE
+      \renewcommand{\formattedRule}{#3 \arrow #4}
+    }% END IF MULTIPLE
+    {paren}
+    {% BEGIN IF PAREN
+      \renewcommand{\formattedRule}{#3 / #4}
+    }% END IF PAREN
+  }% END CASES
+  \ensuremath{\IfStrEq{#1}{written}{\formattedRule}{\mathtt{\formattedRule}}}
+}
+
+% Commands that depend on the kind of letters
+\ifthenelse{\boolean{membranecomputing@blackboard}}{ %
+  \newcommand{\workingalphabet}{\ensuremath{O}}
+  \newcommand{\inputalphabet}{\ensuremath{E}}
+  \newcommand{\initmultiset}[1]{\ensuremath{w_{#1}}}
+  \newcommand{\ruleset}[1]{\ensuremath{R_{#1}}}
+  \newcommand{\probabilitiesset}[1]{\ensuremath{p_{#1}}}
+}{
+  \newcommand{\workingalphabetspiking}{\ensuremath{O}}
+  \newcommand{\workingalphabet}{\ensuremath{\Gamma}}
+  \newcommand{\inputalphabet}{\ensuremath{\Sigma}}
+  \newcommand{\initmultiset}[1]{\ensuremath{\mathcal{M}_{#1}}}
+  \newcommand{\ruleset}[1]{\ensuremath{\mathcal{R}_{#1}}}
+  \newcommand{\probabilitiesset}[1]{\ensuremath{\rho_{#1}}}
+}
+
+% Commands that do not depend on the kind of letters
+\newcommand{\labelset}{\ensuremath{H}}
+\newcommand{\membranestructure}{\ensuremath{\mu}}
+\newcommand{\neuron}[1]{\ensuremath{\sigma_{#1}}}
+\newcommand{\compartment}[1]{\ensuremath{C_{#1}}}
+\newcommand{\agent}[1]{\ensuremath{B_{#1}}}
+\newcommand{\iin}{\ensuremath{i_{in}}}
+\newcommand{\iout}{\ensuremath{i_{out}}}
+\newcommand{\degree}{\ensuremath{q}}
+\newcommand{\syn}{\ensuremath{syn}}
+\newcommand{\yes}{\ensuremath{\mathtt{yes}}}
+\newcommand{\no}{\ensuremath{\mathtt{no}}}
+\newcommand{\initEnvironment}{\ensuremath{v_{E}}}
+
+% Shortcuts
+\newcommand{\wa}{\workingalphabet}
+\newcommand{\ia}{\inputalphabet}
+\newcommand{\ls}{\labelset}
+\newcommand{\ms}{\membranestructure}
+\newcommand{\im}{\initmultiset}
+\newcommand{\rs}{\ruleset}
+\newcommand{\ps}{\probabilitiesset}
+\newcommand{\vE}{\initEnvironment}
+
+\newcommand{\psystem}[5][nonrecognizer]
+{% BEGIN COMMAND PSYSTEM
+  \IfEqCase{#3}
+  {% BEGIN CASES
+    {transition}
+    {% BEGIN IF TRANSITION
+      \ensuremath{\Pi_{#4} = \left(\wa, \ifthenelse{\equal{#1}{recognizer}}{\Sigma, }{} \ifthenelse{\equal{#2}{cell}}{\ms, }{} \im{1}, \dots, \im{\ifthenelse{\equal{#5}{}}{\degree}{#5}}, (\rs{1}, \ps{1}), \dots, (\rs{\ifthenelse{\equal{#5}{}}{\degree}{#5}}, \ps{\ifthenelse{\equal{#5}{}}{\degree}{#5}}), \ifthenelse{\equal{#1}{recognizer}}{\iin, }{} \iout \right)}
+    }% END IF TRANSITION
+    {activemembranes}
+    {% BEGIN IF ACTIVEMEMBRANES
+      \ensuremath{\Pi_{#4} = \left(\wa, \ifthenelse{\equal{#1}{recognizer}}{\Sigma, }{} \ifthenelse{\equal{#2}{cell}}{\ms, }{} \im{1}, \dots, \im{\ifthenelse{\equal{#5}{}}{\degree}{#5}}, \rs{1}, \dots, \rs{\ifthenelse{\equal{#5}{}}{\degree}{#5}}, \ifthenelse{\equal{#1}{recognizer}}{\iin, }{} \iout \right)}
+    }% END IF ACTIVEMEMBRANES
+    {symportantiport}
+    {% BEGIN IF SYMPORTANTIPORT
+      \ensuremath{\Pi_{#4} = \left(\wa, \ifthenelse{\equal{#1}{recognizer}}{\Sigma, }{} \mathcal{E}, \ifthenelse{\equal{#2}{cell}}{\ms, }{} \im{1}, \dots, \im{\ifthenelse{\equal{#5}{}}{\degree}{#5}}, \ifthenelse{\equal{#2}{cell}}{\rs{1}, \dots, \rs{\ifthenelse{\equal{#5}{}}{\degree}{#5}}}{\rs}, \ifthenelse{\equal{#1}{recognizer}}{\iin, }{} \iout \right)}
+    }% END IF SYMPORTANTIPORT
+    {spiking}
+    {% BEGIN IF SPIKING
+      \ensuremath{\Pi_{#4} = \left(\ifthenelse{\boolean{membranecomputing@blackboard}}{\wa}{\workingalphabetspiking}, \neuron{1}, \dots, \neuron{\ifthenelse{\equal{#5}{}}{\degree}{#5}}, \syn, \ifthenelse{\equal{#1}{recognizer}}{\iin, }{} \iout \right)}
+    }% END IF SPIKING
+    {kernel}
+    {% BEGIN IF KERNEL
+      \ensuremath{k\Pi_{#4} = \left(\wa, \ifthenelse{\equal{#2}{cell}}{\ms, }{} \compartment{1}, \dots, \compartment{\ifthenelse{\equal{#5}{}}{\degree}{#5}}, \ifthenelse{\equal{#1}{recognizer}}{\iin, }{} \iout \right)}
+    }% END IF KERNEL
+    {colony}
+    {% BEGIN IF COLONY
+      \ensuremath{\Pi_{#4} = \left(\wa, \ifthenelse{\equal{#1}{recognizer}}{\Sigma, }{} e, f, \vE, \agent{1}, \dots, \agent{\ifthenelse{\equal{#5}{}}{\degree}{#5}}, \ifthenelse{\equal{#1}{recognizer}}{\iin, }{}\right)}
+    }% END IF COLONY
+  }% END CASES
+  [\PackageError{psystem}{Undefined option to psystem: #3}]
+}% END COMMAND PSYSTEM
+
+\newcommand{\wrule}[5][multiple]{\mcrule[written]{#1}{#2}{#3}{#4}{#5}}
+\newcommand{\prule}[5][multiple]{\mcrule[plingua]{#1}{#2}{#3}{#4}{#5}}
+
+\newcommand{\mcrule}[6][written]
+{% BEGIN COMMAND RULE
+  \IfEqCase{#2}
+  {% BEGIN CASES TYPE
+    {rewriting}
+    {% BEGIN IF REWRITING
+      \renewcommand{\lhsC}{}
+      \renewcommand{\rhsC}{}
+      \formatRule{#1}{#2}{#5}{#6}
+    }% END IF REWRITING
+    {single}
+    {% BEGIN IF SINGLE
+      \renewcommand{\lhsC}{}
+      \renewcommand{\rhsC}{}
+      \renewcommand{\lhsL}{}
+      \renewcommand{\rhsL}{}
+      \renewcommand{\lhsP}{}
+      \renewcommand{\rhsP}{}
+      \StrFindGroup{#5}{1}[\lhsC]
+      \StrFindGroup{#6}{1}[\rhsC]
+      \StrFindGroup{#5}{2}[\lhsL]
+      \StrFindGroup{#5}{3}[\lhsP]
+      \renewcommand{\polW}{\ensuremath{\IfStrEq{#1}{written}{^{\lhsP}}{}}}
+      \renewcommand{\polP}{\ensuremath{\IfStrEq{#1}{plingua}{\lhsP}{}}}
+      \renewcommand{\labelSub}{\ensuremath{\IfStrEq{#1}{written}{_{\lhsL}}{'\lhsL}}}
+      \formatRule{#1}{#2}{\ensuremath{\polP \left[ \, \lhsC}}{\ensuremath{\rhsC \, \right]\polW\labelSub}}
+      % \ensuremath{\left[ \, \lhsC \rightarrow \rhsC \, \right]^{\ifthenelse{\equal{\lhsP}{}} {\rhsP} {\lhsP} }_{\ifthenelse{\equal{\lhsL}{}} {\rhsL} {\lhsL} }}
+    }% END IF SINGLE
+    {multiple}
+    {% BEGIN IF MULTIPLE
+     % BEGIN LHS ANALYSIS
+      \renewcommand{\lhsIC}{}
+      \renewcommand{\lhsIL}{}
+      \renewcommand{\lhsIP}{}
+      \renewcommand{\lhsOC}{}
+      \setcounter{membranecomputing@membrane}{1}
+      \whiledo {\value{membranecomputing@membrane} < \numexpr#3+1\relax}
+      {% BEGIN FOR MEMBRANE
+        \StrFindGroup{#5}{\arabic{membranecomputing@membrane}}[\currentM]
+        \IfStrEq{\currentM}{{}}
+        {% BEGIN IF EMPTY GROUP
+         % EMPTY GROUP
+        }% END IF EMPTY GROUP
+        {% BEGIN ELSE EMPTY GROUP
+          \ifthenelse{\equal{\arabic{membranecomputing@membrane}}{1}}
+          {% BEGIN IF IN-MEMBRANE
+            \StrFindGroup{#5}{\arabic{membranecomputing@membrane},1}[\lhsIC]
+            \StrFindGroup{#5}{\arabic{membranecomputing@membrane},2}[\lhsIL]
+            \StrFindGroup{#5}{\arabic{membranecomputing@membrane},3}[\lhsIP]
+            \StrExpand[2]{\lhsIC}{\plhsIC}
+            \renewcommand{\lhsIC}{\expandafter\plhsIC\expandafter \,}
+          }% END IF IN-MEMBRANE
+          {% BEGIN ELSE IN-MEMBRANE
+            \ifthenelse{\equal{\arabic{membranecomputing@membrane}}{2}}
+            {% BEGIN IF OUT-MEMBRANE
+              \StrFindGroup{#5}{\arabic{membranecomputing@membrane},1}[\lhsOC]
+            }% END IF OUT-MEMBRANE
+            {% BEGIN ELSE OUT-MEMBRANE
+              \StrFindGroup{#5}{\arabic{membranecomputing@membrane}}[\currentMembrane]
+              \IfStrEqCase{\currentMembrane}
+              {% BEGIN CASES CURRENTMEMBRANE
+                {{.}}%
+                {% BEGIN IF ...
+                  \StrExpand[2]{\lhsIC}{\plhsIC}%
+                  \renewcommand{\lhsIC}{\ensuremath{\plhsIC \dots \,}}%
+                }% END IF ...
+                {{-}}%
+                {% BEGIN IF --
+                  \StrExpand[2]{\lhsIC}{\plhsIC}%
+                  \renewcommand{\lhsIC}{\ensuremath{\plhsIC - \,}}%
+                }% END IF --
+                {{;}}
+                {% BEGIN IF ;
+                  \StrExpand[2]{\lhsIC}{\plhsIC}%
+                  \renewcommand{\lhsIC}{\ensuremath{\plhsIC ; \,}}%
+                }% END IF ;
+                {\currentMembrane}
+                {% BEGIN IF OTHER
+                  \StrFindGroup{#5}{\arabic{membranecomputing@membrane},1}[\lhsCC]%
+                  \StrFindGroup{#5}{\arabic{membranecomputing@membrane},2}[\lhsCL]%
+                  \StrFindGroup{#5}{\arabic{membranecomputing@membrane},3}[\lhsCP]%
+                  \StrExpand[2]{\lhsIC}{\plhsIC}%
+                  \StrExpand[2]{\lhsCC}{\plhsCC}%
+                  \StrExpand[2]{\lhsCL}{\plhsCL}%
+                  \StrExpand[2]{\lhsCP}{\plhsCP}%
+                  \setcounter{membranecomputing@imembrane}{1}
+                  \whiledo {\value{membranecomputing@imembrane} < 5}
+                  {% BEGIN FOR IMEMBRANE
+                    \stepcounter{membranecomputing@imembrane}
+                  }% END FOR IMEMBRANE
+                  \IfStrEq{\lhsCL}{{!}}%
+                  {% BEGIN IF !
+                    \renewcommand{\lhsIC}{\ensuremath{\plhsIC \{ \IfStrEq{\plhsCC}{}{\quad}{\, \plhsCC \, } \}}}
+                  }% END IF !
+                  {% BEGIN ELSE !
+                    \renewcommand{\polW}{\ensuremath{\IfStrEq{#1}{written}{^{\plhsCP}}{}}}
+                    \renewcommand{\polP}{\ensuremath{\IfStrEq{#1}{plingua}{\plhsCP}{}}}
+                    \renewcommand{\labelSub}{\ensuremath{\IfStrEq{#1}{written}{_{\plhsCL}}{'\plhsCL}}}
+                    \StrExpand[2]{\polW}{\ppolW}
+                    \StrExpand[2]{\polP}{\ppolP}
+                    \StrExpand[2]{\labelSub}{\plabelSub}
+                    \renewcommand{\lhsIC}{\ensuremath{\plhsIC \ppolP[ \IfStrEq{\plhsCC}{}{\quad}{\, \plhsCC \, } ]\ppolW\plabelSub \,}}%
+                    \StrExpand[2]{\lhsIC}{\plhsIC}%
+                    \renewcommand{\lhsIC}{\plhsIC}%
+                  }% END ELSE !
+                }% END IF OTHER
+              }% END CASES CURRENTMEMBRANE
+            }% END ELSE OUT-MEMBRANE
+          }% END ELSE IN-MEMBRANE
+        }% END ELSE EMPTY GROUP
+        \stepcounter{membranecomputing@membrane}
+      }% END FOR MEMBRANE
+     % END LHS ANALYSIS
+     % BEGIN RHS ANALYSIS
+      \renewcommand{\rhsIC}{}
+      \renewcommand{\rhsIL}{}
+      \renewcommand{\rhsIP}{}
+      \renewcommand{\rhsOC}{}
+      \setcounter{membranecomputing@membrane}{1}
+      \whiledo {\value{membranecomputing@membrane} < \numexpr#4+1\relax}
+      {% BEGIN FOR MEMBRANE
+        \StrFindGroup{#6}{\arabic{membranecomputing@membrane}}[\currentM]
+        \IfStrEq{\currentM}{{}}
+        {% BEGIN IF EMPTY GROUP
+         % EMPTY GROUP
+        }% END IF EMPTY GROUP
+        {% BEGIN ELSE EMPTY GROUP
+          \ifthenelse{\equal{\arabic{membranecomputing@membrane}}{1}}
+          {% BEGIN IF IN-MEMBRANE
+            \StrFindGroup{#6}{\arabic{membranecomputing@membrane},1}[\rhsIC]
+            \StrFindGroup{#6}{\arabic{membranecomputing@membrane},2}[\rhsIL]
+            \StrFindGroup{#6}{\arabic{membranecomputing@membrane},3}[\rhsIP]
+            \StrExpand[2]{\rhsIC}{\prhsIC}
+            \renewcommand{\rhsIC}{\expandafter\prhsIC\expandafter \,}
+          }% END IF IN-MEMBRANE
+          {% BEGIN ELSE IN-MEMBRANE
+            \ifthenelse{\equal{\arabic{membranecomputing@membrane}}{2}}
+            {% BEGIN IF OUT-MEMBRANE
+              \StrFindGroup{#6}{\arabic{membranecomputing@membrane},1}[\rhsOC]
+             % \ensuremath{}
+            }% END IF OUT-MEMBRANE
+            {% BEGIN ELSE OUT-MEMBRANE
+              \StrFindGroup{#6}{\arabic{membranecomputing@membrane}}[\currentMembrane]
+              \IfStrEqCase{\currentMembrane}
+              {% BEGIN CASES CURRENTMEMBRANE
+                {{.}}%
+                {% BEGIN IF ...
+                  \StrExpand[2]{\rhsIC}{\prhsIC}%
+                  \renewcommand{\rhsIC}{\ensuremath{\prhsIC \dots \,}}%
+                }% END IF ...
+                {{-}}%
+                {% BEGIN IF --
+                  \StrExpand[2]{\rhsIC}{\prhsIC}%
+                  \renewcommand{\rhsIC}{\ensuremath{\prhsIC - \,}}%
+                }% END IF --
+                {{;}}
+                {% BEGIN IF ;
+                  \StrExpand[2]{\rhsIC}{\prhsIC}%
+                  \renewcommand{\rhsIC}{\ensuremath{\prhsIC ; \,}}%
+                }% END IF ;
+                {\currentMembrane}
+                {% BEGIN IF OTHER
+                  \StrFindGroup{#6}{\arabic{membranecomputing@membrane},1}[\rhsCC]%
+                  \StrFindGroup{#6}{\arabic{membranecomputing@membrane},2}[\rhsCL]%
+                  \StrFindGroup{#6}{\arabic{membranecomputing@membrane},3}[\rhsCP]%
+                  \StrExpand[2]{\rhsIC}{\prhsIC}%
+                  \StrExpand[2]{\rhsCC}{\prhsCC}%
+                  \StrExpand[2]{\rhsCL}{\prhsCL}%
+                  \StrExpand[2]{\rhsCP}{\prhsCP}%
+                  \setcounter{membranecomputing@imembrane}{1}
+                  \whiledo {\value{membranecomputing@imembrane} < 5}
+                  {% BEGIN FOR IMEMBRANE
+                    \stepcounter{membranecomputing@imembrane}
+                  }% END FOR IMEMBRANE
+                  \IfStrEq{\rhsCL}{{!}}%
+                  {% BEGIN IF !
+                    \renewcommand{\rhsIC}{\ensuremath{\prhsIC \{ \IfStrEq{\prhsCC}{}{\quad}{\, \prhsCC \, } \}}}%
+                  }% END IF !
+                  {% BEGIN ELSE !
+                    \renewcommand{\polW}{\ensuremath{\IfStrEq{#1}{written}{^{\prhsCP}}{}}}
+                    \renewcommand{\polP}{\ensuremath{\IfStrEq{#1}{plingua}{\prhsCP}{}}}
+                    \renewcommand{\labelSub}{\ensuremath{\IfStrEq{#1}{written}{_{\prhsCL}}{'\prhsCL}}}
+                    \StrExpand[2]{\polW}{\ppolW}
+                    \StrExpand[2]{\polP}{\ppolP}
+                    \StrExpand[2]{\labelSub}{\plabelSub}
+                    \renewcommand{\rhsIC}{\ensuremath{\prhsIC \ppolP[ \IfStrEq{\prhsCC}{}{\quad}{\, \prhsCC \, } ]\ppolW\plabelSub \,}}%
+                    \StrExpand[2]{\rhsIC}{\prhsIC}%
+                    \renewcommand{\rhsIC}{\prhsIC}%
+                  }% END ELSE !
+                }% END IF OTHER
+              }% END CASES CURRENTMEMBRANE
+            }% END ELSE OUT-MEMBRANE
+          }% END ELSE IN-MEMBRANE
+        }% END ELSE EMPTY GROUP
+        \stepcounter{membranecomputing@membrane}
+      }% END FOR MEMBRANE
+      % END RHS ANALYSIS
+      \StrFindGroup{#5}{1}[\lhsM]
+      \StrFindGroup{#6}{1}[\rhsM]
+      \renewcommand{\polWL}{\ensuremath{\IfStrEq{#1}{written}{^{\lhsIP}}{}}}
+      \renewcommand{\polPL}{\ensuremath{\IfStrEq{#1}{plingua}{\lhsIP}{}}}
+      \renewcommand{\labelSubL}{\ensuremath{\IfStrEq{#1}{written}{_{\lhsIL}}{'\lhsIL}}}
+      \renewcommand{\polWR}{\ensuremath{\IfStrEq{#1}{written}{^{\rhsIP}}{}}}
+      \renewcommand{\polPR}{\ensuremath{\IfStrEq{#1}{plingua}{\rhsIP}{}}}
+      \renewcommand{\labelSubR}{\ensuremath{\IfStrEq{#1}{written}{_{\rhsIL}}{'\rhsIL}}}
+      \formatRule{#1}{#2}{\ifthenelse{\equal{\lhsOC}{}}{}{\lhsOC \,} \IfStrEq{\lhsM}{{}}{}{\polPL\left[} \ifthenelse{\equal{\protect\lhsIC}{}}{\quad}{ \, \lhsIC } \IfStrEq{\lhsM}{{}}{}{\right]\polWL\labelSubL}}{\ifthenelse{\equal{\rhsOC}{}}{}{\rhsOC \,} 
+        \IfStrEq{\rhsM}{{}}{}{\polPR\left[} \ifthenelse{\equal{\protect\rhsIC}{}}{\quad}{ \, \rhsIC } \IfStrEq{\rhsM}{{}}{}{\right]\polWR\labelSubR}}
+      % \ensuremath{\ifthenelse{\equal{\lhsOC}{}}{}{\lhsOC \,} \IfStrEq{\lhsM}{{}}{}{\left[} \ifthenelse{\equal{\protect\lhsIC}{}}{\quad}{ \, \lhsIC } \IfStrEq{\lhsM}{{}}{}{\right]^{\lhsIP}_{\lhsIL}} \rightarrow \ifthenelse{\equal{\rhsOC}{}}{}{\rhsOC \,} 
+      %   \IfStrEq{\rhsM}{{}}{}{\left[} \ifthenelse{\equal{\protect\rhsIC}{}}{\quad}{ \, \rhsIC } \IfStrEq{\rhsM}{{}}{}{\right]^{\rhsIP}_{\rhsIL}}}
+    }% END IF MULTIPLE
+    {paren}
+    {% BEGIN IF PAREN
+      \ifthenelse{\equal{#6}{}}
+      {% BEGIN IF ONE SIDE
+        \StrFindGroup{#5}{1}[\lhsC]
+        \StrFindGroup{#5}{2}[\lhsL]
+        \ensuremath{\left( \lhsC, \lhsL \right)}
+      }% END IF ONE SIDE
+      {% BEGIN ELSE ONE SIDE
+        \StrFindGroup{#5}{1}[\lhsC]
+        \StrFindGroup{#6}{1}[\rhsC]
+        \StrFindGroup{#5}{2}[\lhsL]
+        \StrFindGroup{#6}{2}[\rhsL]
+        \formatRule{#1}{#2}{\left( \lhsL, \lhsC}{\rhsC, \rhsL \right)}
+        % \ensuremath{\left( \lhsL, \lhsC / \rhsC, \rhsL \right)}
+      }% END ELSE ONE SIDE
+    }% END IF PAREN
+    {spike}
+    {% BEGIN IF SPIKE
+      \renewcommand{\lhsE}{}
+      \renewcommand{\lhsS}{}
+      \renewcommand{\rhsS}{}
+      \renewcommand{\rhsD}{}
+      \StrFindGroup{#5}{1}[\lhsE]
+      \StrFindGroup{#5}{2}[\lhsS]
+      \StrFindGroup{#6}{1}[\rhsS]
+      \StrFindGroup{#6}{2}[\rhsD]
+      \ensuremath{\ifthenelse{\equal{\lhsE}{{}}}{}{\lhsE /} \lhsS \rightarrow \rhsS \ifthenelse{\equal{\rhsD}{}}{}{; \rhsD}}
+    }% END IF SPIKE
+  }% END CASES TYPE
+  [\PackageError{rule}{Undefined option to rule: #2}]
+}% END COMMAND RULE
+
+% Templates for P systems
+
+\newcommand{\psystemAM}[1][nonrecognizer]{\psystem[#1]{cell}{activemembranes}{}{}}
+\newcommand{\rpsystemAM}{\psystemAM[recognizer]}
+\newcommand{\psystemSA}[1][nonrecognizer]{\psystem[#1]{tissue}{symportantiport}{}{}}
+\newcommand{\rpsystemSA}{\psystemSA[recognizer]}
+\newcommand{\SNpsystem}[1][nonrecognizer]{\psystem[#1]{tissue}{spiking}{}{}}
+\newcommand{\rSNpsystem}{\SNpsystem[recognizer]}
+\newcommand{\kpsystem}[1][nonrecognizer]{\psystem[#1]{cell}{kernel}{}{}}
+\newcommand{\rkpsystem}{\kpsystem[recognizer]}
+\newcommand{\pcolony}[1][nonrecognizer]{\psystem[#1]{tissue}{colony}{}{}}
+\newcommand{\rpcolony}{\pcolony[recognizer]}
+
+% Rule examples and templates
+
+\newcommand{\rewriting}[2]{\wrule[rewriting]{}{}{#1}{#2}}
+\newcommand{\rewritingT}{\rewriting{u}{v}}
+
+\newcommand{\evolution}[4]{\wrule[single]{}{}{{#1}{#3}{#4}}{{#2}}}
+\newcommand{\evolutionT}{\evolution{a}{b}{h}{\alpha}}
+
+\newcommand{\evolutionP}[4]{\prule[single]{}{}{{#1}{#3}{#4}}{{#2}}}
+\newcommand{\evolutionPT}{\evolutionP{a}{b}{h}{\alpha}}
+
+\newcommand{\pevolution}[3]{\wrule[single]{}{}{{#1}{#3}}{{#2}}}
+\newcommand{\pevolutionT}{\pevolution{a}{b}{h}}
+
+\newcommand{\pevolutionP}[3]{\evolutionP{#1}{#2}{#3}{}}
+\newcommand{\pevolutionPT}{\pevolutionP{a}{b}{h}}
+
+\newcommand{\antiport}[4]{\wrule[paren]{}{}{{#1}{#2}}{{#3}{#4}}}
+\newcommand{\antiportT}{\antiport{u}{i}{v}{j}}
+\newcommand{\symportT}{\antiport{u}{i}{\lambda}{j}}
+
+\newcommand{\antiportP}[4]{\prule[paren]{}{}{{#1}{#2}}{{#3}{#4}}}
+\newcommand{\antiportPT}{\antiportP{u}{i}{v}{j}}
+\newcommand{\symportPT}{\antiportP{u}{i}{\lambda}{j}}
+
+\newcommand{\sendin}[5]{\wrule{2}{1}{{{}{#3}{#4}}{{#1}}}{{{#2}{#3}{#5}}}}
+\newcommand{\sendinT}{\sendin{a}{b}{h}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\sendinP}[5]{\prule{2}{1}{{{}{#3}{#4}}{{#1}}}{{{#2}{#3}{#5}}}}
+\newcommand{\sendinPT}{\sendinP{a}{b}{h}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\psendin}[3]{\sendin{#1}{#2}{#3}{}{}}
+\newcommand{\psendinT}{\psendin{a}{b}{h}}
+
+\newcommand{\psendinP}[3]{\sendinP{#1}{#2}{#3}{}{}}
+\newcommand{\psendinPT}{\psendinP{a}{b}{h}}
+
+\newcommand{\sendout}[5]{\wrule{1}{2}{{{#1}{#3}{#4}}}{{{}{#3}{#5}}{{#2}}}}
+\newcommand{\sendoutT}{\sendout{a}{b}{h}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\sendoutP}[5]{\prule{1}{2}{{{#1}{#3}{#4}}}{{{}{#3}{#5}}{{#2}}}}
+\newcommand{\sendoutPT}{\sendout{a}{b}{h}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\psendout}[3]{\sendout{#1}{#2}{#3}{}{}}
+\newcommand{\psendoutT}{\psendout{a}{b}{h}}
+
+\newcommand{\psendoutP}[3]{\sendoutP{#1}{#2}{#3}{}{}}
+\newcommand{\psendoutPT}{\psendoutP{a}{b}{h}}
+
+\newcommand{\dissolution}[4]{\wrule{3}{2}{{}{}{{#1}{#3}{#4}}}{{}{{#2}}}}
+\newcommand{\dissolutionT}{\dissolution{a}{b}{h}{\alpha}}
+
+\newcommand{\dissolutionP}[4]{\prule{3}{2}{{}{}{{#1}{#3}{#4}}}{{}{{#2}}}}
+\newcommand{\dissolutionPT}{\dissolutionP{a}{b}{h}{\alpha}}
+
+\newcommand{\pdissolution}[3]{\dissolution{#1}{#2}{#3}{}}
+\newcommand{\pdissolutionT}{\pdissolution{a}{b}{h}}
+
+\newcommand{\pdissolutionP}[3]{\dissolutionP{#1}{#2}{#3}{}}
+\newcommand{\pdissolutionPT}{\pdissolutionP{a}{b}{h}}
+
+\newcommand{\division}[7]{\wrule{1}{4}{{{#1}{#4}{#5}}{}}{{}{}{{#2}{#4}{#6}}{{#3}{#4}{#7}}}}
+\newcommand{\divisionT}{\division{a}{b}{c}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\divisionP}[7]{\prule{1}{4}{{{#1}{#4}{#5}}{}}{{}{}{{#2}{#4}{#6}}{{#3}{#4}{#7}}}}
+\newcommand{\divisionPT}{\divisionP{a}{b}{c}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\pdivision}[4]{\division{#1}{#2}{#3}{#4}{}{}{}}
+\newcommand{\pdivisionT}{\pdivision{a}{b}{c}{h}}
+
+\newcommand{\pdivisionP}[4]{\divisionP{#1}{#2}{}{#3}{}{#4}{}}
+\newcommand{\pdivisionPT}{\pdivisionP{a}{h}{b}{c}}
+
+\newcommand{\separation}[5]{\wrule{1}{4}{{{#1}{#2}{#3}}{}}{{}{}{{\wa_{0}}{#2}{#4}}{{\wa_{1}}{#2}{#5}}}}
+\newcommand{\separationT}{\separation{a}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\separationP}[5]{\prule{1}{4}{{{#1}{#2}{#3}}{}}{{}{}{{\wa_{0}}{#2}{#4}}{{\wa_{1}}{#2}{#5}}}}
+\newcommand{\separationPT}{\separationP{a}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\pseparation}[2]{\separation{#1}{#2}{}{}{}}
+\newcommand{\pseparationT}{\pseparation{a}{h}}
+
+\newcommand{\pseparationP}[2]{\separationP{#1}{#2}{}{}{}}
+\newcommand{\pseparationPT}{\pseparationP{a}{h}}
+
+\newcommand{\creation}[8]{\wrule{1}{3}{{{#1}{#4}{#6}}}{{{#2}{#4}{#7}}{}{{#3}{#5}{#8}}}}
+\newcommand{\creationT}{\creation{a}{b}{c}{h}{h_{1}}{\alpha}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\creationP}[8]{\prule{1}{3}{{{#1}{#4}{#6}}}{{{#2}{#4}{#7}}{}{{#3}{#5}{#8}}}}
+\newcommand{\creationPT}{\creationP{a}{b}{c}{h}{h_{1}}{\alpha}{\alpha_{1}}{\alpha_{2}}}
+
+\newcommand{\pcreation}[5]{\creation{#1}{#2}{#3}{#4}{#5}{}{}{}}
+\newcommand{\pcreationT}{\pcreation{a}{b}{c}{h}{h_{1}}}
+
+\newcommand{\pcreationP}[5]{\creationP{#1}{#2}{#3}{#4}{#5}{}{}{}}
+\newcommand{\pcreationPT}{\pcreationP{a}{b}{c}{h}{h_{1}}}
+
+\newcommand{\spiking}[4]{\wrule[spike]{}{}{{#1}{#2}}{{#3}{#4}}}
+\newcommand{\spikingT}{\spiking{E}{a^{n}}{a}{d}}
+\newcommand{\forgettingT}{\spiking{}{a^{n}}{\lambda}{}}
+
+\newcommand{\spikingP}[4]{\prule[spike]{}{}{{#1}{#2}}{{#3}{#4}}}
+\newcommand{\spikingPT}{\spikingP{E}{a^{n}}{a}{d}}
+\newcommand{\forgettingPT}{\spikingP{}{a^{n}}{\lambda}{}}
+
+\newcommand{\krewriting}[3]{\wrule{2}{3}{{}{{#1}}}{{}{{#2}}{{#3}{!}}}}
+\newcommand{\krewritingT}{\krewriting{x}{y}{g}}
+
+\newcommand{\krewritingP}[3]{\prule{2}{3}{{}{{#1}}}{{}{{#2}}{{#3}{!}}}}
+\newcommand{\krewritingPT}{\krewritingP{x}{y}{g}}
+
+\newcommand{\linkcreation}[5]{\wrule{5}{6}{{}{}{{#1}{#3}}{;}{{}{#4}}}{{}{}{{#2}{#3}}{-}{{}{#4}}{{#5}{!}}}}
+\newcommand{\linkcreationT}{\linkcreation{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}}
+
+\newcommand{\linkcreationP}[5]{\prule{5}{6}{{}{}{{#1}{#3}}{;}{{}{#4}}}{{}{}{{#2}{#3}}{-}{{}{#4}}{{#5}{!}}}}
+\newcommand{\linkcreationPT}{\linkcreationP{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}}
+
+\newcommand{\linkdestruction}[5]{\wrule{5}{6}{{}{}{{#1}{#3}}{-}{{}{#4}}}{{}{}{{#2}{#3}}{;}{{}{#4}}{{#5}{!}}}}
+\newcommand{\linkdestructionT}{\linkdestruction{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}}
+
+\newcommand{\linkdestructionP}[5]{\prule{5}{6}{{}{}{{#1}{#3}}{-}{{}{#4}}}{{}{}{{#2}{#3}}{;}{{}{#4}}{{#5}{!}}}}
+\newcommand{\linkdestructionPT}{\linkdestructionP{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}}
+
+% Families of P systems
+
+\newcommand{\Pfamily}[4]{\ensuremath{\mathcal{#1}^{#2}_{#3} \IfStrEq{#4}{}{}{( #4 )}}}
+\newcommand{\AM}[2][]{\Pfamily{AM}{#1}{}{#2}}
+\newcommand{\AMO}[1]{\Pfamily{AM}{0}{}{#1}}
+\newcommand{\TC}[2][]{\Pfamily{T#1C}{}{}{#2}}
+\newcommand{\TDC}[1]{\TC[D]{#1}}
+\newcommand{\TSC}[1]{\TC[S]{#1}}
+\newcommand{\CC}[2][]{\Pfamily{C#1C}{}{}{#2}}
+\newcommand{\CDC}[1]{\CC[D]{#1}}
+\newcommand{\CSC}[1]{\CC[S]{#1}}
+\newcommand{\TEC}[2][]{\TC[#1E]{#2}}
+\newcommand{\TDEC}[1]{\TEC[D]{#1}}
+\newcommand{\TSEC}[1]{\TEC[S]{#1}}
+\newcommand{\CEC}[2][]{\CC[#1E]{#2}}
+\newcommand{\CDEC}[1]{\CEC[D]{#1}}
+\newcommand{\CSEC}[1]{\CEC[S]{#1}}
+
+% Terms of computability theory
+
+\newcommand{\compSet}[1]{\ensuremath{#1}}
+\newcommand{\REG}{\compSet{REG}}
+\newcommand{\LIN}{\compSet{LIN}}
+\newcommand{\CF}{\compSet{CF}}
+\newcommand{\CS}{\compSet{CS}}
+\newcommand{\RE}{\compSet{RE}}
+
+% Terms of computational complexity theory
+
+\newcommand{\complClass}[3]{\ensuremath{\mathbf{#1MC}^{#2}_{#3}}}
+\newcommand{\PMC}[2][]{\complClass{P}{#1}{#2}}
+\newcommand{\PSPACEMC}[2][]{\complClass{PSPACE}{#1}{#2}}
+\newcommand{\EXPMC}[2][]{\complClass{EXP}{#1}{#2}}
+\newcommand{\EXPSPACEMC}[2][]{\complClass{EXPPSPACE}{#1}{#2}}
+
+\fullexpandarg
+\noexploregroups
+
+\endinput
+
+v0.1 23/07/2020
+  - Created package
+  - Created some examples and templates
\ No newline at end of file
diff --git a/macros/latex/contrib/membranecomputing/membranecomputing.tex b/macros/latex/contrib/membranecomputing/membranecomputing.tex
new file mode 100644
index 0000000000..a8c9207207
--- /dev/null
+++ b/macros/latex/contrib/membranecomputing/membranecomputing.tex
@@ -0,0 +1,486 @@
+\documentclass{article}
+
+\usepackage[utf8]{inputenc}
+
+\usepackage{membranecomputing}
+\usepackage{hyperref}
+\usepackage{enumitem}
+\usepackage{amssymb}
+\usepackage{longtable}
+
+\title{Package \texttt{membranecomputing} (v0.1)}
+\author{David Orellana-Martín \\ \texttt{\href{mailto:dorellana@us.es}{dorellana@us.es}}}
+\begin{document}
+
+\maketitle
+
+\tableofcontents
+
+\section{Introduction}
+\label{sec:introduction}
+
+Membrane computing is a framework where different models of
+computations, called membrane systems or P systems arise from. The
+notation of these models is very variate since the number of
+researchers in the area is very high, and also their background is
+different, and therefore the notation can slightly change. The idea of
+this package is to cover all the possible variants in the area and
+their respective rules. Concerning the rules, the objective is
+twofold: On the one hand, to use commands to transcript a rule in a
+paper format; On the other hand, since P-Lingua is the \textit{de
+  facto} standard language for simulating P systems, there is a
+possibility to print the rules in the P-Lingua language, ready to be
+copied and pasted into a \texttt{.pli} file.
+
+\section{Package options}
+\label{sec:package-options}
+
+The \texttt{membranecomputing} package offers the option
+\texttt{blackboard}. The differences of this option can be found in
+Subsection~\ref{sec:font-option}.
+
+\subsection{Font option}
+\label{sec:font-option}
+
+Notation of P systems can change depending on the model. But even with
+the same model, some differences can be found between different
+papers. For instance, while some researchers use the symbol $\Gamma$
+to denote the working alphabet, other use the letter $O$. Other
+example is the use of the letters $\mathcal{M}_{i}$ or $w_{i}$ for
+describing the initial multisets of the regions. For this purpose,
+this option has been implemented.
+
+\begin{itemize}
+\item \texttt{traditional} (\textit{Default}) This typesets the
+  symbols like
+  $\Gamma, \Sigma, \mathcal{M}_{i}, \mathcal{R}_{i},
+  \rho_{i}$~\footnote{For SNP systems, the singleton $\{a\}$, is still
+    called $O$ in this mode.}.
+\item \texttt{blackboard} This typesets the symbols like
+  $O, E, w_{i}, R_{i}, p_{i}$.
+\end{itemize}
+
+The rest of the symbols are defined without taking into account this option.
+
+\section{Using the package}
+\label{sec:using-package}
+
+In this section I will try to explain all the different uses of this
+package, from basic use to creation of new templates.
+
+\subsection{Basic notations}
+\label{sec:basic-notations}
+
+This is a list of some notations that can be used for defining initial
+multisets, sets of rules, and so on.
+
+\vspace{1mm}
+
+$
+\begin{array}{lll}
+  \mbox{Working alphabet} & \verb=\wa= & \wa \\
+  \mbox{Input alphabet} & \verb=\ia= & \ia \\
+  \mbox{Labels set} & \verb=\ls= & \ls \\
+  \mbox{Membrane structure} & \verb=\ms= & \ms \\
+  \mbox{Initial multiset} & \verb=\im{i}= & \im{i} \\
+  \mbox{Rule set} & \verb=\rs{i}= & \rs{i} \\
+  \mbox{Probabilities set} & \verb=\ps{i}= & \ps{i} \\
+  \mbox{vE} & \verb=\vE= & \vE \\
+  \mbox{Neuron} & \verb=\neuron{i}= & \neuron{i} \\
+  \mbox{Compartment} & \verb=\compartment{i}= & \compartment{i} \\
+  \mbox{Agent} & \verb=\agent{i}= & \agent{i} \\
+  \mbox{Degree} & \verb=\degree= & \degree \\
+  \mbox{Synapses} & \verb=\syn= & \syn \\
+  \mbox{Input region} & \verb=\iin= & \iin \\
+  \mbox{Output region} & \verb=\iout= & \iout \\
+  \mbox{Object yes} & \verb=\yes= & \yes \\
+  \mbox{Object no} & \verb=\no= & \no \\
+\end{array}
+$
+
+\subsection{Languages and computability theory}
+\label{sec:lang-comp-theory}
+
+$
+\begin{array}{lll}
+  \mbox{Regular language} & \verb=\REG= & \REG \\
+  \mbox{Linear language} & \verb=\LIN= & \LIN \\
+  \mbox{Context-free language} & \verb=\CF= & \CF \\
+  \mbox{Context-sensitive language} & \verb=\CS= & \CS \\
+  \mbox{Recursively enumerable language} & \verb=\RE= & \RE \\
+\end{array}
+$
+
+To define a new set of languages, it is enough to make a new command
+as follows:
+
+\begin{verbatim}
+\newcommand{\L}{\compSet{L}}
+\end{verbatim}
+
+This results in: $\compSet{L}$.
+
+\subsection{Families of membrane systems}
+\label{sec:famil-membr-syst}
+
+Since the number of ``ingredients'' of the different variants of P
+systems is sometimes high, then some notations can be used to short
+them whenever they must be used. For instance, polarizationless P
+systems with active membranes when dissolution rules and division
+rules only for elementary membranes are allowed is usually denoted as
+$\AMO{-d, +ne}$. To denote this, it is enough to write
+\verb=\AM0{d, +ne}=. In this package, some examples of different
+families of P systems are defined.
+
+$
+\begin{array}{lll}
+  \mbox{Ps with am} & \verb=\AM[\alpha]{\beta}= & \AM[\alpha]{\beta} \\
+  \mbox{Polarizationless Ps with am} & \verb=\AMO{\alpha}= & \AMO{\alpha} \\
+  \mbox{Tissue Ps with s/a rules} & \verb=\TC[\alpha]{\beta}= & \TC[\alpha]{\beta} \\
+  \mbox{Tissue Ps with s/a and division rules} & \verb=\TDC{\alpha}= & \TDC{\alpha} \\
+  \mbox{Tissue Ps with s/a and separation rules} & \verb=\TSC{\alpha}= & \TSC{\alpha} \\
+  \mbox{Ps with s/a rules} & \verb=\CC[\alpha]{\beta}= & \CC[\alpha]{\beta} \\
+  \mbox{Ps with s/a and division rules} & \verb=\CDC{\alpha}= & \CDC{\alpha} \\
+  \mbox{Ps with s/a and separation rules} & \verb=\CSC{\alpha}= & \CSC{\alpha} \\
+  \mbox{Tissue Ps with evol. comm. rules} & \verb=\TEC[\alpha]{\beta}= & \TEC[\alpha]{\beta} \\
+  \mbox{Tissue Ps with evol. comm. and division rules} & \verb=\TDEC{\alpha}= & \TDEC{\alpha} \\
+  \mbox{Tissue Ps with evol. comm. and separation rules} & \verb=\TSEC{\alpha}= & \TSEC{\alpha} \\
+  \mbox{Ps with evol. comm. rules} & \verb=\CEC[\alpha]{\beta}= & \CEC[\alpha]{\beta} \\
+  \mbox{Ps with evol. comm. and division rules} & \verb=\CDEC{\alpha}= & \CDEC{\alpha} \\
+  \mbox{Ps with evol. comm. and separation rules} & \verb=\CSEC{\alpha}= & \CSEC{\alpha}
+\end{array}
+$
+
+To define a new notation for a family of membrane systems, it is
+enough to make a new command as follows:
+
+\begin{verbatim}
+\newcommand{\MS}[3]{\Pfamily{MS}{#1}{#2}{#3}}
+\end{verbatim}
+
+This results in: $\Pfamily{MS}{\#2}{\#3}{\#4}$.
+
+\subsection{Computational complexity theory}
+\label{sec:comp-compl-theory}
+
+It is usual to define different complexity classes in the framework
+of membrane computing. In this sense, it would be interesting to
+automate the definition of these classes to avoid using all \LaTeX
+commands each time we want to use them.
+
+$
+\begin{array}{lll}
+    \mbox{} & \verb=\PMC[\alpha]{\beta}= & \PMC[\alpha]{\beta} \\
+    \mbox{} & \verb=\PSPACEMC[\alpha]{\beta}= & \PSPACEMC[\alpha]{\beta} \\
+    \mbox{} & \verb=\EXPMC[\alpha]{\beta}= & \EXPMC[\alpha]{\beta} \\
+    \mbox{} & \verb=\EXPSPACEMC[\alpha]{\beta}= & \EXPSPACEMC[\alpha]{\beta} \\
+\end{array}
+$
+
+To define a new notation for a complexity class in membrane systems, it is
+enough to make a new command as follows:
+
+\begin{verbatim}
+\newcommand{\C}[3]{\complClass{C}{#1}{#2}}
+\end{verbatim}
+
+This results in: $\complClass{C}{\#1}{\#2}$~\footnote{CMC does not
+  stand for Conference on Membrane Computing here.}.
+
+\subsection{P systems}
+\label{sec:p-systems}
+
+One of the two main contributions of this package is to make easier to
+name a P system. Usually, when we have to define a new membrane
+system, we have to write something like 
+
+\begin{verbatim}
+\Pi = (\Gamma, \mu, H, \mathcal{M}_1, \mathcal{M}_{2}, \mathcal{R}, i_{out})
+\end{verbatim}
+
+For making this task easier, the command \verb=psystem= has been
+defined. Basically, it takes 5 arguments (first is optional) and can
+be used as follows: \verb=\psystem[#1]{#2}{#3}{#4}{#5}=, where
+
+\begin{enumerate}[label=\texttt{\#\arabic*}]
+\item $\in \{\mathtt{recognizer}, \mathtt{nonrecognizer}\}$: adds an
+  input alphabet and an input region.
+\item $\in \{\mathtt{cell}, \mathtt{tissue}\}$: adds a membrane
+  structure in the first case.
+\item
+  $\in \{\mathtt{transition}, \mathtt{activemembranes},
+  \mathtt{symportantiport}, \mathtt{spiking}, \mathtt{kernel},
+  \mathtt{colony}\}$: changes some of the parameters of the P system.
+\item is a subscript for the symbol $\Pi$.
+\item $> 1$ is the degree of the system.
+\end{enumerate}
+
+For instance, the command
+\begin{verbatim}
+\psystem[recognizer]{cell}{activemembranes}{1}{10}
+\end{verbatim}
+would lead to the following:
+
+\begin{center}
+  \psystem[recognizer]{cell}{activemembranes}{1}{10}
+\end{center}
+
+Some templates have been prepared for most of the usual variants of P
+systems:
+
+$
+\begin{array}{ll}
+  \verb=\psystemAM= & \psystemAM \\
+  \verb=\rpsystemAM= & \rpsystemAM \\
+  \verb=\psystemSA= & \psystemSA \\
+  \verb=\rpsystemSA= & \rpsystemSA \\
+  \verb=\SNpsystem= & \SNpsystem \\
+  \verb=\rSNpsystem= & \rSNpsystem \\
+  \verb=\kpsystem= & \kpsystem \\
+  \verb=\rkpsystem= & \rkpsystem \\
+  \verb=\pcolony= & \pcolony \\
+  \verb=\rpcolony= & \rpcolony \\
+\end{array}
+$
+
+All commands preceded by a \verb=r= are the recognizer version of
+their r-less counterpart.
+
+\subsection{Rules}
+\label{sec:rules}
+
+The (current) big work of this paper is to normalise the notation of
+the rules of P systems. Several differences can be found in the
+literature, most of them about spacing, position of elements, and so
+on. The idea is to unify these notations in one big element: the
+\verb=\mcrule= command. This command tries to cover all types of rules
+in the membrane computing framework, including esoteric rules that
+could arise. The idea is to catch some basic elements and parse them
+in order to obtain the whole rule. As some types of P systems use
+different notations, as arrows, separators and so on, different cases
+have being contemplated. The definition of this command is
+\verb=\mcrule[#1]{#2}{#3}{#4}{#5}{#6}=, where:
+
+\begin{enumerate}[label=\texttt{\#\arabic*}]
+\item $\in \{\mathtt{written} (\mathit{Default}), \mathtt{plingua}\}$: the first one
+  makes it look as the usual scientific notation while the second one
+  transforms the rule into P-Lingua notation.
+\item It can be one of the following parameters:
+  
+  $
+  \begin{array}{lll}
+    \mathtt{rewriting} & \mbox{Classical rewriting rules} & \rewritingT \\
+    \mathtt{single} & \mbox{Rules with a single pair of brackets} & \pevolutionT \\
+    \mathtt{multiple} & \mbox{Rules with different brackets in the LHS and the RHS} & \psendoutT \\
+    \mathtt{paren} & \mbox{Rules delimited by parentheses} & \antiportT \\
+    \mathtt{spike} & \mbox{Spiking rules} & \spikingT
+  \end{array}
+$
+\item $> 1$: Number of regions in the LHS (the main region and the outside regions are counted as one)
+\item $> 1$: Number of regions in the RHS (the main region and the outside regions are counted as one)
+\item explained below
+\item explained below
+\end{enumerate}
+
+The \verb=\mcrule= command is a tool capable of representing a wide
+variety of types of rule. The idea is to represent all the rules in a
+standardised way and well-spaced. An example with each type of rule is
+given:
+
+\begin{itemize}
+\item $\mathtt{rewriting}$: \verb=\mcrule{rewriting}{}{}{u}{v}= will
+  produce $\mcrule{rewriting}{}{}{u}{v}$.
+\item $\mathtt{single}$:
+  \verb=\mcrule{single}{}{}{{a}{h}{+}}{{c_{2}\alpha}}= will produce
+  $\mcrule{single}{}{}{{a}{h}{+}}{c_{2}\alpha}$.
+\item $\mathtt{multiple}$:\newline
+  \verb=\mcrule{multiple}{4}{4}{{{a}{3}{+}}{{b}}{{e_{1}}{4}}{;}}=\newline
+  \verb={{}{{a}}{-}{{o}{!}}}= will produce\newline
+  $\mcrule{multiple}{4}{4}{{{a}{3}{+}}{{b}}{{e_{1}}{4}}{;}}{{}{{a}}{-}{{o}{!}}}$. I
+  will explain in detail what means each thing:
+  \begin{itemize}
+  \item \verb={4}{4}=: In the left-hand side of the rule, 4
+    ``regions'' will be analysed (in this case, membrane $3$, its
+    parent membrane, membrane $4$ and a special symbol); In the
+    right-hand side of the rule, 4 ``regions'' will be analysed (in
+    this case, the empty ``main'' membrane, its parent membrane, a
+    special symbol and a special region)~\footnote{It is a very
+      strange rule, but it will be useful to explain some special
+      cases to use in your own rules.}.
+  \item \verb={{{a}{3}{+}}{{b}}{{e_{1}}{4}}{;}}=: It is divided into
+    four parts:
+    \begin{itemize}
+    \item \verb={{a}{3}{+}}=: The ``main'' membrane of the rule has
+      label $3$ and polarisation $+$, and its contents is an object
+      $a$.
+    \item \verb={{b}}=: The outer content of the ``main'' membrane is
+      an object $b$.
+    \item \verb={{e_{1}}{4}}=: It has a inner membrane with label $4$
+      and its contents is an object $e_{1}$.
+    \item \verb={;}=: It writes down a $;$ symbol~\footnote{Useful for
+        creation/deletion rules in kP systems.}.
+    \end{itemize}
+  \item \verb={{}{{a}}{-}{{o}{!}}}=: It is divided into four
+    parts:
+    \begin{itemize}
+    \item \verb={}=: The ``main'' membrane of the rule is not
+      specified, so it is omitted~\footnote{Useful for dissolution
+        rules.}.
+    \item \verb={{a}}=: The outer content of the ``main'' membrane is
+      an object $a$.
+    \item \verb=-= It writes down a $-$ symbol~\footnote{Also useful
+        for creation/deletion rules in kP systems.}.
+    \item \verb={{o}{!}}=: The symbol $!$ in the label is a reserved
+      character to write down a guard $\{ o \}$~\footnote{Also used in
+      kP systems.}.
+    \end{itemize}
+  \end{itemize}
+\item $\mathtt{paren}$: \verb=\mcrule{paren}{}{}{{ab}{3}}{{c}{2}}=
+  will produce $\mcrule{paren}{}{}{{ab}{3}}{{c}{2}}$.
+\item $\mathtt{spike}$:
+  \verb=\mcrule{spike}{}{}{{a^{3}}{a^{2}}}{{a}{1}}= will produce
+  $\mcrule{spike}{}{}{{a^{3}}{a^{2}}}{{a}{1}}$.
+\end{itemize}
+
+Using $\mathtt{plingua}$ instead of
+$\mathtt{written}$ as the optional parameter, it will write the rule
+in the P-Lingua syntax. Therefore, the $\mathtt{multiple}$ rule
+previously used in this section would render as\newline
+$\mcrule[plingua]{multiple}{4}{4}{{{a}{3}{+}}{{b}}{{e_{1}}{4}}{;}}{{}{{a}}{-}{{o}{!}}}$.
+
+With this, anyone can create almost any kind of rule that one could
+think~\footnote{Do you have any idea about other kind of rule? Please
+  write me so I can think in a way to implement it.}. However, for the
+sake of simplicity, I have defined some commands for the basic types
+of rules from the bibliography. 
+
+{\footnotesize
+\begin{longtable}{ll}
+  \verb=\rewriting{u}{v}= & $\rewriting{u}{v}$ \\
+  \verb=\rewritingT= & $\rewritingT$ \\
+  \verb=\evolution{a}{b}{h}{\alpha}= & $\evolution{a}{b}{h}{\alpha}$ \\
+  \verb=\evolutionT= & $\evolutionT$ \\
+  \verb=\evolutionP{a}{b}{h}{\alpha}= & $\evolutionP{a}{b}{h}{\alpha}$ \\
+  \verb=\evolutionPT= & $\evolutionPT$ \\
+  \verb=\pevolution{a}{b}{h}= & $\pevolution{a}{b}{h}$ \\
+  \verb=\pevolutionT= & $\pevolutionT$ \\
+  \verb=\pevolutionP{a}{b}{h}= & $\pevolutionP{a}{b}{h}$ \\
+  \verb=\pevolutionPT= & $\pevolutionPT$ \\
+  \verb=\antiport{u}{i}{v}{j}= & $\antiport{u}{i}{v}{j}$ \\
+  \verb=\antiportT= & $\antiportT$ \\
+  \verb=\symportT= & $\symportT$ \\
+  \verb=\antiportP{u}{i}{v}{j}= & $\antiportP{u}{i}{v}{j}$ \\
+  \verb=\antiportPT= & $\antiportPT$ \\
+  \verb=\symportPT= & $\symportPT$ \\
+  \verb=\sendin{a}{b}{h}{\alpha_{1}}{\alpha_{2}}= & $\sendin{a}{b}{h}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\sendinT= & $\sendinT$ \\
+  \verb=\sendinP{a}{b}{h}{\alpha_{1}}{\alpha_{2}}= & $\sendinP{a}{b}{h}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\sendinPT= & $\sendinPT$ \\
+  \verb=\psendin{a}{b}{h}= & $\psendin{a}{b}{h}$ \\
+  \verb=\psendinT= & $\psendinT$ \\
+  \verb=\psendinP{a}{b}{h}= & $\psendinP{a}{b}{h}$ \\
+  \verb=\psendinPT= & $\psendinPT$ \\
+  \verb=\sendout{a}{b}{h}{\alpha_{1}}{\alpha_{2}}= & $\sendout{a}{b}{h}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\sendoutT= & $\sendoutT$ \\
+  \verb=\sendoutP{a}{b}{h}{\alpha_{1}}{\alpha_{2}}= & $\sendoutP{a}{b}{h}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\sendoutPT= & $\sendoutPT$ \\
+  \verb=\psendout{a}{b}{h}= & $\psendout{a}{b}{h}$ \\
+  \verb=\psendoutT= & $\psendoutT$ \\
+  \verb=\psendoutP{a}{b}{h}= & $\psendoutP{a}{b}{h}$ \\
+  \verb=\psendoutPT= & $\psendoutPT$ \\
+  \verb=\dissolution{a}{b}{h}{\alpha}= & $\dissolution{a}{b}{h}{\alpha}$ \\
+  \verb=\dissolutionT= & $\dissolutionT$ \\
+  \verb=\dissolutionP{a}{b}{h}{\alpha}= & $\dissolutionP{a}{b}{h}{\alpha}$ \\
+  \verb=\dissolutionPT= & $\dissolutionPT$ \\
+  \verb=\pdissolution{a}{b}{h}= & $\pdissolution{a}{b}{h}$ \\
+  \verb=\pdissolutionT= & $\pdissolutionT$ \\
+  \verb=\pdissolutionP{a}{b}{h}= & $\pdissolutionP{a}{b}{h}$ \\
+  \verb=\pdissolutionPT= & $\pdissolutionPT$ \\
+  \verb=\division{a}{b}{c}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}= & $\division{a}{b}{c}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\divisionT= & $\divisionT$ \\
+  \verb=\divisionP{a}{b}{c}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}= & $\divisionP{a}{b}{c}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\divisionPT= & $\divisionPT$ \\
+  \verb=\pdivision{a}{b}{c}{h}= & $\pdivision{a}{b}{c}{h}$ \\
+  \verb=\pdivisionT= & $\pdivisionT$ \\
+  \verb=\pdivisionP{a}{b}{c}{h}= & $\pdivisionP{a}{b}{c}{h}$ \\
+  \verb=\pdivisionPT= & $\pdivisionPT$ \\
+  \verb=\separation{a}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}= & $\separation{a}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\separationT= & $\separationT$ \\
+  \verb=\separationP{a}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}= & $\separationP{a}{h}{\alpha}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\separationPT= & $\separationPT$ \\
+  \verb=\pseparation{a}{h}= & $\pseparation{a}{h}$ \\
+  \verb=\pseparationT= & $\pseparationT$ \\
+  \verb=\pseparationP{a}{h}= & $\pseparationP{a}{h}$ \\
+  \verb=\pseparationPT= & $\pseparationPT$ \\
+  \verb=\creation{a}{b}{c}{h}{h_{1}}{\alpha}{\alpha_{1}}{\alpha_{2}}= & $\creation{a}{b}{c}{h}{h_{1}}{\alpha}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\creationT= & $\creationT$ \\
+  \verb=\creationP{a}{b}{c}{h}{h_{1}}{\alpha}{\alpha_{1}}{\alpha_{2}}= & $\creationP{a}{b}{c}{h}{h_{1}}{\alpha}{\alpha_{1}}{\alpha_{2}}$ \\
+  \verb=\creationPT= & $\creationPT$ \\
+  \verb=\pcreation{a}{b}{c}{h}{h_{1}}= & $\pcreation{a}{b}{c}{h}{h_{1}}$ \\
+  \verb=\pcreationT= & $\pcreationT$ \\
+  \verb=\pcreationP{a}{b}{c}{h}{h_{1}}= & $\pcreationP{a}{b}{c}{h}{h_{1}}$ \\
+  \verb=\pcreationPT= & $\pcreationPT$ \\
+  \verb=\spiking{E}{a^{n}}{a}{d}= & $\spiking{E}{a^{n}}{a}{d}$ \\
+  \verb=\spikingT= & $\spikingT$ \\
+  \verb=\forgettingT= & $\forgettingT$ \\
+  \verb=\spikingP{E}{a^{n}}{a}{d}= & $\spikingP{E}{a^{n}}{a}{d}$ \\
+  \verb=\spikingPT= & $\spikingPT$ \\
+  \verb=\forgettingPT= & $\forgettingPT$ \\
+  \verb=\krewriting{x}{y}{g}= & $\krewriting{x}{y}{g}$ \\
+  \verb=\krewritingT= & $\krewritingT$ \\
+  \verb=\krewritingP{x}{y}{g}= & $\krewritingP{x}{y}{g}$ \\
+  \verb=\krewritingPT= & $\krewritingPT$ \\
+  \verb=\linkcreation{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}= & $\linkcreation{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}$ \\
+  \verb=\linkcreationT= & $\linkcreationT$ \\
+  \verb=\linkcreationP{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}= & $\linkcreationP{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}$ \\
+  \verb=\linkcreationPT= & $\linkcreationPT$ \\
+  \verb=\linkdestruction{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}= & $\linkdestruction{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}$ \\
+  \verb=\linkdestructionT= & $\linkdestructionT$ \\
+  \verb=\linkdestructionP{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}= & $\linkdestructionP{x}{y}{t_{l_{i}}}{t_{l_{j}}}{g}$ \\
+  \verb=\linkdestructionPT= & $\linkdestructionPT$
+\end{longtable}
+}
+
+As you can see, the names follow a pattern:
+
+\begin{itemize}
+\item Their name is descriptive in terms of the rule it represents.
+\item If the rule starts with a \texttt{p}, it means that it is a
+  polarizationless rule.
+\item If the rule ends with (or its second to last letter is) a
+  \texttt{P}, it means it will write the rule in P-Lingua format.
+\item If the rule ends with a \texttt{T}, it means it is a rule
+  template; that is, the typical rule used to describe its behaviour.
+\end{itemize}
+
+If you have an idea to make the notation simpler, please let me know.
+
+\section{Future work}
+\label{sec:future-work}
+
+A TODO list for the future development of the package. Please do not
+hesitate to contact me if you think that something should be included
+in this list, or if there is any bug or concept that should be
+included as soon as possible. Please, contact me at
+\href{mailto:dorellana@us.es}{dorellana@us.es}
+
+\begin{itemize}
+\item Add new variants of P systems, as well as some new templates for
+  other rules.
+\item Clean the code and create new command for analysing the
+  \texttt{multiple} case automatically.
+\item Add the possibility of define rules with more than one level of
+  deepness.
+\item Add a automatic parsing of a membrane structure, so a
+  well-spaced structure can appear in a paper. It would be interesting
+  to also let it export a string in the P-Lingua format.
+\item A long-term objective is to export a .pdf with the picture of a
+  P system with its contents. Creating an image for your paper could
+  be as simple as defining it as you usually do, it would be cool, right?
+\end{itemize}
+
+I hope you find the package interesting and useful for your
+purposes. And, as I said above, please do not hesitate to contact me
+if you have any questions of or suggestions for it.
+
+\end{document}