def cxSet(ind1, ind2):
 temp = set(ind1)
 ind1 &= ind2
 ind2 ^= temp
 return (ind1, ind2)

def cxSet ( ind1 , ind2 ) : temp = set ( ind1 ) ind1 &= ind2 ind2 ^= temp return ( ind1 , ind2 )
apply a crossover operation on input sets .