[issue4816] Patch of itertools.{combinations, permutations} for empty combinations

[David W. Lambert]

David W. Lambert <lambertdw at corning.com> added the comment:

Mathematica returns an empty list.

In[1]:= Permutations[{1,2},{1}]

Out[1]= {{1}, {2}}

In[2]:= Permutations[{1,2},{4}]

Out[2]= {}

In[3]:=

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nosy: +LambertDW

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