def __iter__(self): return itertools.ifilter(lambda p: p.isEven, Permutation.s_n(self.n))
def __iter__(self): return itertools.ifilter(lambda p: p.isEven, Permutation.s_n(self.n))
def __iter__(self): return Permutation.s_n(self.n)
def __iter__(self): return Permutation.s_n(self.n) def __contains__(self, x):