<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\psset{arrows=-&gt;,framearc=.2}
\def\Treebox#1{%
 \Tr{\psframebox{#1}}
}
\pstree[treemode=R]
{\Treebox{A$\rightarrow$B}}{
\pstree{
   \Treebox{B$\rightarrow$C}
         }{
 \Treebox{A$\rightarrow$D}
\pstree[treemode=L]
 {\Treebox{B$\rightarrow$E}}
 {\Tn\TC[arrows=&lt;-]}
      }
}
</pre></body></html>