%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-3-5 on page I-158 in "Plural forms".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{123.0pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{acro}
\DeclareAcronym{mp}{short = MP\@, long = Member of Parliament,
                    long-plural-form = Members of Parliament}
%StopShownPreambleCommands

\begin{document}
\acp{mp}, \acp{mp}
\end{document}