%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 5-6-3 on page 267.
%%
%% 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{207.0pt}
\StartShownPreambleCommands
\usepackage{array,hhline}
\StopShownPreambleCommands
\begin{document}
\setlength\arrayrulewidth{.8pt}
\renewcommand\arraystretch{1.5}
\begin{tabular}{||cc||c|c||c}
                 \hhline{|t:==:t:==:t|}
a & b & c & d \\ \hhline{|:==:|~|~||}
1 & 2 & 3 & 4 \\ \hhline{#==#~|=:b|-}
i & j & k & l & \multicolumn{1}{c|}{?}
              \\ \hhline{||--||---}
w & x & y & z \\ \hhline{|b:==:b:==:b|}
\end{tabular}
\end{document}