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\documentclass{standalone}
\usepackage{binarytree}
\usetikzlibrary{graphs}
\begin{document}
\btreeset{math labels,scale=0.7}
\begin{tikzpicture}
\BinaryTree[local bounding box=INIT]{%
:1!l:w!r:x:red!l:\sigma,ll!l:\sigma,lr!r:\sigma,
r:w!r:y!r:\sigma,rr!l:\sigma,rl!l:\sigma}{3}
\BinaryTree[local bounding box=FINAL,xshift=10cm]{
:1!l:w!l:x':red!l:\sigma,lr!r:\sigma,ll!r:\sigma,
r:w!r:y!r:\sigma,rr!l:\sigma,rl!l:\sigma}{3}
\graph[use existing nodes]{ INIT -> FINAL};
\end{tikzpicture}
\end{document}
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