<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\begin{calstable}
\colwidths{{100pt}}
\brow
\def\cals@AtBeginCell{\show A}
\def\cals@AtEndCell{\show B}
\cell{a}
\def\cals@AtBeginCell{\show C}
\def\cals@AtEndCell{\show D}
\nullcell{ltb}
\nullcell{rtb}\spancontent{b}
\erow
\end{calstable}
</pre></body></html>