David W. Lambert <lamber...@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]:=
----------
nosy: +LambertDW
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<http://bugs.python.org/issue4816>
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