Copy into this automaton all states in the given automaton reachable from a given root state.
NOTE: all references valid prior to this call remain valid and the automaton remains minimised (provided it was minimised initially), although it may not remain compacted if any new states are unreachable.
@param root --- root index to begin copying from. @param automaton --- other automaton to copy states from (can bethis
).
@return
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