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Use the built-in Python command itertools.combinations:
sage: import itertools
sage: L = [1..5]; L
[1, 2, 3, 4, 5]
sage: for s in itertools.combinations(L, 3):
....: print s
....:
(1, 2, 3)
(1, 2, 4)
(1, 2, 5)
(1, 3, 4)
(1, 3, 5)
(1, 4, 5)
(2, 3, 4)
(2, 3, 5)
(2, 4, 5)
(3, 4, 5)
