def test_DocFileSuite():
>>> perm2('123')
dataset/ETHPy150Open babble/babble/include/jython/Lib/test/test_doctest.py/test_DocFileSuite--crossover with--dataset/ETHPy150Open bt3gl/Python-and-Algorithms-and-Data-Structures/src/builtin_structures/permutations.py/perm2