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\documentclass{ppex}
\nonstopmode
\usepackage [curve,frame]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [curve,frame]{xy}
\[\begin{xy}
0*[o]+{L};(50,20)*[o]+{R}="R"
**\crv{} ?(.6)*@{+}*^+!UL{0}
,"R" **\crv{(30,30)} ?*@{+}*^+!DR{1}
,"R" **\crv{(20,30)&(30,40)} ?*@{+}*^+!DR{2}
,"R" **\crv{(10,-20)&(25,-20)&(40,20)}
?(.4)*@{+}*^+!DR{3}
,"R" **\crv{(0,-10)&(12,-20)&(28,25)&(40,20)}
?(.4)*@{+}*^+!DR{4}
\end{xy}\]
\end{document}
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