\documentclass{ppex}
\nonstopmode
\usepackage [frame]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [frame]{xy}
\[\begin{xy}
 (0,0)*+++{L}="l";
 p+(15,10)*+++{M}**\frm{_)}% 1
               **\frm{\{}  % 2
              ;**\frm{\}}  % 3
,p+(15,10)*+++{R}**\frm{(} % 4
               **\frm{\}}  % 5
           ;"l"**\frm{^\}} % 6
\end{xy}\]
\end{document}

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