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Complexity of computing subgroupthe order given generatorsof a permutation group

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Aryeh
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Complexity of computing subgroup order given generators

Given two permutations $g$ and $h$ over $n$ elements (i.e., members of $S_n$), what is the complexity of computing the order of the subgroup generated by $g,h$? Or just of deciding whether the subgroup is of order $n!$ (i.e., all of $S_n$)?