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If you only need to order the outgoing edges the problem is GI complete. Reduce from GI of directed graphs. Given a digraph $D$ make a new one $D’$ as follows: Make a vertex in $D’$ for every vertex of $D$ and every arc of $D$. For every arc $u \rightarrow v$ of $D$, add the arcs: $uv \rightarrow u$ and $uv \rightarrow v$ in $D’$ (in this order). Clearly $D’$...


This paper claims to provide minimized NFA in linear time:

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