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%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example A-1-10 on page 852.
%%
%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
%% Johannes Braams, David Carlisle, and Chris Rowley
%%
%% It 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.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%
\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}
\StartShownPreambleCommands
\newcounter{ex} \renewcommand\theex{\thesection.\alph{ex}}
\newenvironment{EX}{\begin{flushleft}%
\textbf{\refstepcounter{ex}Exercise~\theex:}}
{\end{flushleft}}
\setcounter{section}{4} % for testing
\StopShownPreambleCommands
\begin{document}
\section{A Failure}
\begin{EX} \label{A} A test. \end{EX}
\begin{EX} \label{B} Another test. \end{EX}
Referencing exercises: \ref{A} and \ref{B}.
\end{document}
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