Master/texmf-doc/doc/english/latex-graphics-companion/5-5-11.ltx


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\documentclass{ppex}
\nonstopmode
\usepackage [all,2cell]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [all,2cell]{xy}
\UseTwocells
\[
\xymatrix{L\rtwocell^u_d & R}
\]
\end{document}