2

for x in range(0, 2):
    for y in range(0, 2):
        for z in range(0, 2):
            for w in range(0, 2):
                if not (x is not z) or ((x or w) is y) == False:
                    print("x=", x, "; y=", y, "; z=", z, "; w=", w, sep='')