[issue14831] make r argument on itertools.combinations() optional

[Dirkjan Ochtman]

Dirkjan Ochtman <dirkjan at ochtman.nl> added the comment:

[[], [0], [1], [2], [0, 1], [0, 2], [1, 2], [0, 1, 2]]

That is, all possible combinations.

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<http://bugs.python.org/issue14831>
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