<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\psset{arrows=-&gt;,labelsep=3pt,
linecolor=gray,mnode=circle,shortput=nab}
\begin{psmatrix}[rowsep=20pt,colsep=28pt]
A &amp; B \\
$\sqrt{\frac{x + y}{z}}$ &amp; D
\psset{linestyle=dotted}
\ncline{1,1}{1,2}^{\emph{firstly}}
\ncline{1,2}{2,2}&gt;{\emph{next}}
\ncline{2,2}{2,1}_{\emph{then}}
\ncline{2,1}{1,1}&lt;{\emph{lastly}}
\end{psmatrix}
</pre></body></html>