To generate all permutations of a given set means to find all possible ways the elements of the set can be arranged. For example, if the given set is {1, 2, 3} the permutations are:
1 2 3 1 3 2 2 1 3 2 3 1 3 1 2 3 2 1
The . . . → Read More: PHP function to generate all permutations
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