%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 8-3-9 on page 489.
%%
%% 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{delarray}
\StopShownPreambleCommands
\begin{document}
\[ \mathcal{Q} =
\begin{array}[t] ( {cc} ) X & Y \end{array}
\begin{array}[t] [ {cc} ] A & B \\ C & D   \end{array}
\begin{array}[b] \lgroup{cc}\rgroup L \\ M \end{array}
\]
\end{document}
