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diff --git a/macros/latex/contrib/ifallfalse/README.md b/macros/latex/contrib/ifallfalse/README.md
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+# The LaTeX package ifallfalse - version 1.0.0 (2021/07/01)
+
+> Copyright (C) 2021 Dennis Chen <proofprogram@gmail.com>
+>
+> This file may be distributed and/or modified under
+> the conditions the LaTeX Project Public License (LPPL),
+> either version 1.3 of this license or (at your option)
+> any later version. The latest version of this license
+> can be found 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.
+
+`ifallfalse` provides an environment that can compare a string against a set of another strings, and if it matches none of them, it executes some action.
+
+## Package contents
+
+- `README.md` this file
+- `ifallfalse.pdf` documentation PDF with implementation details 
+- `ifallfalse.dtx` contains package and documentation code
+- `ifallfalse.ins` generates .sty from .dtx
+
+## File generation
+
+A working TeX installation is required.
+
+Run
+
+    tex ifallfalse.ins
+
+to generate `ifallfalse.sty`. To use it, you need to put `ifallfalse.sty` into a directory searched by TeX.
+
+Run
+
+    pdflatex ifallfalse.dtx
+
+to generate `ifallfalse.pdf`, which contains the package documentation.
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diff --git a/macros/latex/contrib/ifallfalse/ifallfalse.dtx b/macros/latex/contrib/ifallfalse/ifallfalse.dtx
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+% \iffalse meta-comment
+%
+% Copyright (C) 2021 Dennis Chen <proofprogram@gmail.com>
+%
+% This file may be distributed and/or modified under
+% the conditions the LaTeX Project Public License (LPPL),
+% either version 1.3 of this license or (at your option)
+% any later version. The latest version of this license
+% can be found 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
+%<package>
+%<package>\NeedsTeXFormat{LaTeX2e}
+%<package>\ProvidesPackage{ifallfalse}[2021/07/01 v1.0.0 Compare string against set of other strings]
+
+%<*driver>
+\documentclass{ltxdoc}
+\usepackage{ifallfalse}
+\EnableCrossrefs
+\CodelineIndex
+\RecordChanges
+\begin{document}
+    \DocInput{ifallfalse.dtx}
+    \PrintIndex
+\end{document}
+%</driver>
+% \fi
+%
+% \changes{v1.0.0}{2021/07/01}{Initial version}
+%
+% \GetFileInfo{ifallfalse.sty}
+%
+% \title{\textsf{ifallfalse} -- Compare string against set of strings}
+% \author{Dennis Chen \\ proofprogram@gmail.com}
+% \date{\fileversion, v. \filedate\thanks{\url{https://github.com/chennisden/ifallfalse}}}
+%
+% \maketitle
+%
+% \begin{abstract}
+% The \textsf{ifallfalse} package is a package that allows you to check whether a string is contained within another set of strings, and perform an action if it is not.
+% \end{abstract}
+%
+% \section{Usage}
+%
+% The package provides an \textsf{ifallfalse} environment and a macro |\orcheck| to be used inside the \textsf{ifallfalse} environment.
+%
+% \DescribeEnv{ifallfalse}
+% To set up an ifallfalse environment, simply write
+% \begin{verbatim}
+%\begin{ifallfalse}{string}{action}
+%
+%\end{ifallfalse}
+% \end{verbatim}
+% \textsf{string} will be compared to the set of strings (which we will declare via |\orcheck|), and if \textsf{string} does not match the set of strings, \textsf{action} will be executed.
+%
+% \DescribeMacro{\orcheck}
+%
+% To add strings to the set that \textsf{string} will be compared to, we must write |\orcheck{setstring}| inside the corresponding \textsf{ifallfalse} environment. Then, \textsf{action} will not execute if \textsf{string} matches \textsf{setstring} or any arguments of previous |\orcheck| declarations.
+%
+% If no |\orcheck| declarations exist, then \textsf{action} will always be executed.
+%
+% \subsection{Error Checking}
+%
+% The package checks whether the macro |\orcheck| is used inside an \textsf{ifallfalse} environment. If it is not, the package throws an error.
+%
+% \section{Example}
+%
+% Here is a simple example to demonstrate how \textsf{ifallfalse} is used.
+% \begin{verbatim}
+%\documentclass{minimal}
+%
+%\begin{document}
+%
+%\begin{ifallfalse}{purple}{This color is not red, blue, or green!}
+%    \orcheck{red}
+%    \orcheck{blue}
+%    \orcheck{green}
+%\end{ifallfalse}
+%
+%\end{document}
+% \end{verbatim}
+%
+% In this case, because \textsf{purple} does not match \textsf{red}, \textsf{blue}, or \textsf{green}, the action --- which is printing \textsf{This color is not red, blue, or green!} --- will execute at that location inside the document.
+%
+% \section{Implementation}
+% 
+% These are the implementation details of package \textsf{ifallfalse}. Because the package is so short, we can explain everything.
+% 
+% \begin{environment}{ifallfalse}
+% When setting up ifallfalse, we locally define the |\comparedstring| macro with the first argument that the environment takes in. This is what will be compared against all the strings passed in through the |\orcheck| declarations inside the environment.
+%
+% Then, we define our body of logic (which we will be adding onto through |\orcheck|) to just initially consist of the action we would like to perform if |\comparedstring| matches none of the strings passed in through |\orcheck|.
+%    \begin{macrocode}
+\newenvironment{allfalse}[2]
+{
+    \def\comparedstring{#1}
+    \def\logicbody{#2}
+}
+{
+    \logicbody
+}
+%    \end{macrocode}
+% \end{environment}
+%
+% \begin{macro}{\orcheck}
+% We first save \textsf{allfalse} to a macro so we can use |\ifx| to compare the current environment name against it. If we can, then we add some following (somewhat convoluted) code to |\logicbody|. I will explain what each piece of it does, though not in the order the pieces of code appear.
+% \begin{itemize}
+% \item |\ifx\@currenvir\@allfalsename| evaluates to true if the current environment (whose name is saved to the macro |\@currenvir|) matches the name of |\@allfalsename|, or \textsf{allfalse}.
+% \item If it evaluates to \textsf{false}, the package throws an error.
+% \item The line |\pdfstrcmp{\comparedstring}{#1}=0| evaluates to true when put with |\ifnum| if the two arguments passed into |\pdfstrcmp| are equal, because |pdfstrcmp| compares their lexographical order and returns 0 if the two strings are lexographically equivalent.
+% \item Thus, we can treat |\ifnum\pdfstrcmp{\comparedstring}{#1}=0| as an expression that evaluates to true if |\comparedstring| and |#1| match, and false otherwise.
+% \item When all is said and done, the logic reduces to something of the form
+% \begin{verbatim}
+% \if\else
+% \if\else
+% \ldots action
+% \fi\ldots \fi
+% \end{verbatim}
+% Logically, \textsf{action} will only execute if all the conditions are false; in other words, it will only execute if |\comparedstring| does not match any of the strings passed in via |\orcheck|. This is because each |\else| branch must execute. 
+% \end{itemize}
+%    \begin{macrocode}
+\newcommand*\@allfalsename{allfalse}
+
+\newcommand{\orcheck}[1]{
+    \ifx\@currenvir\@allfalsename
+        \protected@edef\logicbody{
+            \ifnum\pdfstrcmp{\comparedstring}{#1}=0\else\logicbody\fi
+        }
+    \else
+        \PackageError{ifallfalse}{
+            \protect\orcheck\space should be nested within the allfalse environment
+        }{}
+    \fi
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \Finale
+\endinput
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diff --git a/macros/latex/contrib/ifallfalse/ifallfalse.ins b/macros/latex/contrib/ifallfalse/ifallfalse.ins
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+%% Copyright (C) 2021 Dennis Chen <proofprogram@gmail.com>
+%%
+%% This work may be distributed and/or modified under
+%% the conditions the LaTeX Project Public License (LPPL),
+%% either version 1.3 of this license or (at your option)
+%% any later version. The latest version of this license
+%% can be found 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/ifallfalse}
+
+\preamble
+This work may be distributed and/or modified under
+the conditions the LaTeX Project Public License (LPPL),
+either version 1.3 of this license or (at your option)
+any later version. The latest version of this license
+can be found 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{ifallfalse.sty}{\from{ifallfalse.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{*     ifallfalse.sty                                        *}
+\Msg{*                                                           *}
+\Msg{* To produce the documentation, run the file                *}
+\Msg{* ifallfalse.dtx through LaTeX.                             *}
+\Msg{*                                                           *}
+\Msg{* Happy TeXing!                                             *}
+\Msg{*                                                           *}
+\Msg{*************************************************************}
+
+\endbatchfile
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diff --git a/macros/latex/contrib/ifallfalse/ifallfalse.pdf b/macros/latex/contrib/ifallfalse/ifallfalse.pdf
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