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%%  Ein Beispiel der DANTE-Edition
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%%  1. Auflage
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%%  Beispiel 06-03-16 auf Seite 232.
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%%  Copyright (C) 2011 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.
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{142.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{array}
\StopShownPreambleCommands
\begin{document}
\begin{tabular}{|l!{\vrule width 3pt}l|c|l|l|}\hline
L& L& C& L& L\\ LL&\multicolumn{3}{c|}{CCC}& L\\\hline
\end{tabular}
\end{document}