Orbits and schreier vectors
Orbits and Schreier vectors allow us to decide whether there is an element mapping one point to another, and to determine such an element, if it exists. The cost of determining all the orbits and Schreier vectors is O(¦Ω¦×¦S¦). The cost of determining an element mapping one point to another is O(¦Ω¦2).
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