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\usepackage {pstcol,pst-node}
\psset{arrows=->,labelsep=3pt,
linecolor=gray,mnode=circle}
\begin{psmatrix}[rowsep=20pt,colsep=28pt]
A & B \\ $\sqrt{\frac{x + y}{z}}$ & D
\psset{linestyle=dotted}
\ncline{1,1}{1,2}^{\emph{firstly}}
\ncline{1,2}{2,2}>{\emph{next}}
\ncline{2,2}{2,1}_{\emph{then}}
\ncline{2,1}{1,1}<{\emph{lastly}}
\end{psmatrix}
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