\listfiles
\documentclass{jarticle}
\usepackage{array}
\usepackage{amsmath,example51}
\begin{document}

\verb|\newcolumntype{C}[1]{>{\hfil}m{#1}<{\hfil}}|
\newcolumntype{C}[1]{>{\hfil}m{#1}<{\hfil}}
\begin{example}
\begin{tabular}{|C{10em}|c|}
\hline
Cozy lummox gives smart squid \newline who asks ...
& Cozy lummox gives smart squid who asks ...\\
\hline
&ee\\
\hline
\end{tabular}
\end{example}

\end{document}
