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\documentclass{ppex}
\nonstopmode
\usepackage [frame]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [frame]{xy}
\[\begin{xy}
0*+++{L}*\frm<2pt>{-,}
,(10,10)*++{M}*\frm{o};
(20,15)*+{R}*\frm{=}**\frm{o-}
\end{xy}\]
\end{document}
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