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\documentclass{article}
\usepackage{pst-node}
\usepackage{pstricks-add}
\pagestyle{empty}
\begin{document}
\begin{pspicture}(10,7)
\psgrid[subgriddiv=0,griddots=10,gridcolor=gray,gridlabels=7pt]
\psset{linewidth=1mm,radius=0.5}
\Cnode(4,3){A}
\Cnode(6,2){B}
\Cnode(4,6){C}
\Cnode(3,0){D}
\SpecialCoor
\psline[linestyle=dashed,linewidth=0.1pt](A)(B)(C)(D)(B)
\psline[linestyle=dashed,linewidth=0.1pt](C)(A)(D)
\psline[linestyle=dashed,linewidth=0.1pt](0,2)(10,2)
\psline[linestyle=dashed,linewidth=0.1pt](0,3)(10,3)
\psline[linestyle=dashed,linewidth=0.1pt](0,5)(10,0)
\psline(A)(B)
\psline[linecolor=red](C)([Xnodesep=4]A)
\psline[linecolor=green](C)([nodesep=4]A)
\psline[linecolor=cyan](C)([Xnodesep=3]{A}B)
\psline[linecolor=blue](C)([Ynodesep=3]{A}B)
\psline[linecolor=magenta](C)([Ynodesep=3]{B}A)
\psline[linecolor=yellow](C)([Xnodesep=3]{B}A)
\psline{->}([Xnodesep=4]{A}B)([Ynodesep=5]{D}C)
\end{pspicture}
\end{document}
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