path: root/Master/texmf-dist/doc/generic/pstricks/lgc/4-6-28.inl

\begin{psmatrix}
  A                        & B \\
  $\sqrt{\frac{x + y}{z}}$ & D
  \ncline{1,1}{1,2}
  \ncline{1,2}{2,2}
  \ncline{2,2}{2,1}
  \ncline{2,1}{1,1}
\end{psmatrix}