from itertools import *
def f(x, y, z, w):
    return (x and z) or ((w <= x) == (z <= y))
for a1, a2, a3, a4, a5, a6 in product([0, 1], repeat = 6):
    table = [(a1, a2, a3, 1), (a4, a5, 1, 1), (a6, 1, 1, 1)]
    if len(table) == len(set(table)):
        for p in permutations('wxyz'):
            if [f(**dict(zip(p, r))) for r in table] == [0, 0, 0]:
                print(p)