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@@ -964,9 +964,10 @@ original tree $T$. We look them up in the precomputed run, then apply $A$'s
transition to those states and $v$'s new label.
We will compute the states of part roots in a bottom-up fashion, so the second
-case is also simple: once we've computed the states in the children of $v$, we
-again simply apply $A$'s transition function to those states and $v$'s new
-label.
+case is also simple. Both of $v$'s children are roots of parts (since the LCA
+partition is based on a partition ready set), so once we've computed the states
+in the children of $v$, we again simply apply $A$'s transition function to those
+states and $v$'s new label.
The third is the interesting case, that of a subtree with a hole. Consider the
path from the hole $w$ up to the root $v$. What we claim is that the question