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Calculates different arrangements of a set. for more information about the math behind check this paper.
Permutations are arrangements of objects (with or without repetition), the order does matter
permutations (list, repeat)
Combinations are selections of objects, with or without repetition, the order does not matter.
combinations (list, number, repeat)
Variations are arrangements of selections of objects, where the order of the selected objects matters.
variations (list, number, repeat)