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$
\begin{xy}
(0,0);<\xylength,0em>:
*+{P};
p+/u\xylength/*+{O}**\dir2{-}=''O'',
...
...rt},p+/l0.1em/**\dir{}?<*\dir{\vert},p+/r0.1em/**\dir{}?<*\dir{\vert},
\end{xy}$


\begin{psfrags}\psfrag{P} [c][c]{P}\psfrag{O} [c][c]{O}\psfrag{Cl} [c][c]{...
...sfrag{schemaPi} [c][c]{schema {$\pi$}}
\includegraphics{opcl3.eps}
\end{psfrags}