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\documentclass{ppex}
\nonstopmode
\usepackage [all,knot,poly,dvips]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [all,knot,poly,dvips]{xy}
\renewcommand{\labelstyle}{\scriptstyle}
\renewcommand{\objectstyle}{\scriptstyle}
\[\xygraph{!{0;/r2mm/:}
!P3"t"{~>{.}}
!P6"h"{~:{(4.5,0):}~>{.}~*{\xypolynode}}
!P12"d"{~:{(9,0):}~>{.}~*{\xypolynode}}
!P12"D"{~:{(13.,0):}~>{.}~*{\xypolynode}}
!{\xoverv~{"h2"}{"h1"}{"t1"}{"t3"}@(.62)}
!{\xoverv~{"h4"}{"h3"}{"t2"}{"t1"}@(.62)}
!{\xoverv~{"h6"}{"h5"}{"t3"}{"t2"}@(.62)}
!{\vover~{"d4"}{"d3"}{"h3"}{"h2"}}
,"d4"-@`{"D5","D6"}"d7",
!{\vover~{"d8"}{"d7"}{"h5"}{"h4"}}
,"d8"-@`{"D9","D10"}"d11",
!{\vover~{"d12"}{"d11"}{"h1"}{"h6"}}
,"d12"-@`{"D1","D2"}"d3"
}\]
\end{document}
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