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| def head(x): | |
| return x[0] | |
| def tail(x): | |
| return x[1:] | |
| def powerset(x): | |
| if x == []: | |
| return [[]] | |
| else: | |
| tail_set = powerset(tail(x)) | |
| return tail_set + [[head(x)] + s for s in tail_set] | |
| print(powerset([1, 2, 3])) |
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