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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 3-3-21 on page 142.
+%%
+%% 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{111.0pt}
+
+\addtolength\textwidth{-2pt}     % for the example in the book
+
+\StartShownPreambleCommands
+\usepackage{ragged2e,amsthm}
+\newtheoremstyle{break}%
+  {9pt}{9pt}%              Space above and below
+  {\itshape\RaggedRight}%  Body style
+  {-12pt}%                 Heading indent amount
+  {\sffamily\bfseries}{:}% Heading font and punctuation after it
+  {\newline}%         Space after heading (\newline = linebreak)
+  {}%                 Head spec (empty = same as `plain' style)
+\theoremstyle{break}
+\newtheorem{exa}{Exercise}
+\StopShownPreambleCommands
+\begin{document}
+\begin{exa}[Active author]
+   Find the author responsible for the largest number of
+   packages  described in The \LaTeX{} Companion.
+\end{exa}
+\end{document}