%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 10-1-11 on page 600.
%%
%% 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{159.0pt}
\StartShownPreambleCommands
\usepackage{fancybox}
\newcommand\HR{\rule{.5em}{0.4pt}}
\StopShownPreambleCommands
\begin{document}
\HR\begin{Bflushleft}[b]
 \begin{Bflushleft}[t] A A A\\ A A A\\ A A
 \end{Bflushleft}   \HR
 \begin{Bflushright}[t] B\\ B B B\\ B B B\\ B B
 \end{Bflushright}  \par\vspace{0pt}
\end{Bflushleft}    \HR
\begin{Bcenter} C C C\\ C\\ C C\end{Bcenter} \HR
\end{document}