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Using Sage code:

sage: X = Set([1, 3, "two"])  # note capital S
sage: X.subsets()
Subsets of {1, 3, 'two'}
sage: X.subsets(size=2)
Subsets of {1, 3, 'two'} of size 2
sage: X.subsets(size=2).list()
[{1, 3}, {1, 'two'}, {3, 'two'}]