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# The LaTeX package ifallfalse - version 1.0.1 (2021/07/12)
> 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 `allfalse` environment that can compare a string against a set of another strings, and if it matches none of them, it executes some action.
Note that this package does not work with the `lualatex` engine.
## 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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