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\documentclass{ppex}
\nonstopmode
\usepackage {xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {xy}
\[\begin{xy}
0*{DL};<1cm,1cm>*{UR}**@{-}
,<0cm,1cm>*{UL};<1cm,0cm>*{DR}**@{=}
\end{xy}\]
\end{document}
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