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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 10-03-4 on page 203.
+%% 
+%%  Copyright (C) 2010 Herbert Voss
+%% 
+%%  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.
+%% 
+%% 
+%% ==== 
+% Show page(s) 1
+%% 
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+
+\StopShownPreambleCommands
+\begin{document}
+\[ \left(
+\begin{array}{c@{}c@{}c}
+  \begin{array}{|cc|}\hline
+    a_{11} & a_{12} \\a_{21} & a_{22} \\\hline
+  \end{array} & 0 & 0 \\
+  0 & \begin{array}{|ccc|}\hline
+        b_{11} & b_{12} & b_{13}\\
+        b_{21} & b_{22} & b_{23}\\
+        b_{31} & b_{32} & b_{33}\\\hline
+      \end{array} & 0 \\
+0 & 0 & \begin{array}{|cc|}\hline
+          c_{11} & c_{12} \\  c_{21} & c_{22} \\\hline
+        \end{array}
+\end{array}
+\right) \]
+\end{document}