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\newgray{shade}{0.6512}\psset{fillcolor=shade}\pspolygon(234.48,224.75)(236.46,210.57)(230.43,197.19)(228.22,210.15)
\newgray{shade}{0.8916}\psset{fillcolor=shade}\pspolygon(224.06,228.14)(230.25,230.76)(224.43,217.38)(219.17,218.13)
\newgray{shade}{0.7885}\psset{fillcolor=shade}\pspolygon(230.25,230.76)(234.48,224.75)(228.22,210.15)(224.43,217.38)
% front edges
\psline[linestyle=dotted,linewidth=0.9pt,linecolor=black,fillstyle=none]{-}(300.00,198.38)(178.62, 87.74)
\psline[linestyle=dotted,linewidth=0.9pt,linecolor=black,fillstyle=none]{-}(163.55,  0.00)(178.62, 87.74)
\psline[linestyle=dotted,linewidth=0.9pt,linecolor=black,fillstyle=none]{-}(178.62, 87.74)(  0.00,237.00)
\end{picture}