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public python v1 · immutabledef powerset(S): if S == []: return [[]] else: return powerset(S[1:]) + \ [x + [S[0]] for x in powerset(S[1:])] def powerset(S): if S == []: return [[]] else: return powerset(S[1:]) + \ [x + [S[0]] for x in powerset(S[1:])]