\documentclass{article}
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\usepackage{ifthen}
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\usepackage{datetime}
\lhead{./certificates/march3testa1-march3testa2/sim-1.tex}
\rhead{10:52:32.949 on 2025-03-31}
\fancyfoot{}
\begin{document}
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\draw[->, thick] (n1n1n0n2n0n1n0) edge [near start, left, bend left] node {x3} (n1n1n0n2);
\draw[->, thick] (n2) edge [near start, left] node {a} (n2n0);
\draw[->, thick] (n2) edge [near start, left] node {b} (n2n1);
\draw[->, thick] (n2n0) edge [near start, left] node {x1} (n2n0n0);
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\draw[->, thick] (n2n1) edge [near start, left] node {a} (n2n1n0);
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\end{tikzpicture}
\end{tabular}}}
\end{center}
\end{document}
