\documentclass{jarticle}
\usepackage{eepic,epicslbx}

\begin{document}

\verb|\usepackage{eepic,epicslbx}|

\vskip 8pt

\begin{tabular}{|c||c|c|c|c|}\hline
\backslashbox{bc}{de}& \makebox[3em]{\texttt{00}}& \makebox[3em]{\texttt{01}}& \makebox[3em]{\texttt{10}}& \makebox[3em]{\texttt{11}}\\
\hline
\texttt{00} &&&& \\ \hline
\texttt{01} &&&& \\ \hline
\texttt{10} &&&& \\ \hline
\texttt{11} &&&& \\ \hline
\end{tabular}

\end{document}
