Permutations in Java version-2.0
Example: {1, 2, 3} => [1, 2, 3, 12, 13, 21, 23, 31, 32, 121, 122, 123, 131, 132, 133, 211, 212, 213, 231, 232, 233, 311, 312, 313, 321, 322, 323]
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