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permutations


Define permutations(items) to return a list of all the possible permutations (different orderings) of the items. items will be a list, and the result of permutations(items) will be a list of lists, where each one has all the elements of items, but in different order.


permutations(['A', 'B', 'C']) → [['A', 'B', 'C'], ['B', 'A', 'C'], ['B', 'C', 'A'], ['A', 'C', 'B'], ['C', 'A', 'B'], ['C', 'B', 'A']]
permutations([1, 2]) → [[1, 2], [2, 1]]
permutations(['ONE']) → [['ONE']]

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def permutations(items):

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