\documentclass[11pt]{report}
\input{header}
\pagestyle{empty}
\begin{document}
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  \pnode(4,4){a2}
  \pnode(-4,4){b1}
  \pnode(4,-4){b2}
  \arrEmptyVertex(0,0){0}
  \arrEmptyVertex(-3,-3){1}
  \arrEmptyVertex(3,-3){2}
  \arrEmptyVertex(3,3){3}
  \arrEmptyVertex(-3,3){4}
  %
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  \ncline[linewidth=1pt,linecolor=blue]{1}{0}
  \ncline[linewidth=1pt,linecolor=blue]{0}{3}
  \ncline[linewidth=1pt,linecolor=blue]{3}{a2}
  %
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  \ncline[linewidth=1pt,linecolor=blue]{0}{2}
  \ncline[linewidth=1pt,linecolor=blue]{2}{b2}
  %
  \ncline[linewidth=1pt,linecolor=red]{1}{2}
  \ncline[linewidth=1pt,linecolor=red]{2}{3}
  \ncline[linewidth=1pt,linecolor=red]{3}{4}
  \ncline[linewidth=1pt,linecolor=red]{4}{1}
  %
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  \rput(1,3.5){\textcolor{purple}{$B_1$}}
  \rput(3.5,-1){\textcolor{purple}{$C_1$}}
  \rput(-1,-3.5){\textcolor{purple}{$D_1$}}
  %
  \rput(-2,-1){\textcolor{purple}{$A_2$}}
  \rput(-1,2){\textcolor{purple}{$B_2$}}
  \rput(2,1){\textcolor{purple}{$C_2$}}
  \rput(1,-2){\textcolor{purple}{$D_2$}}
  %
  \psframe[linewidth=0.25pt](-4,-4.5)(4,4.5)
  \endpspicture
}
\end{document}
