print('x','y','z','w')
for x in 0,1:
    for y in 0,1:
        for z in 0,1:
            for w in 0,1:
                if (not((x ==y)or(y==w)or(w == z)) +(x or (not (y)))):
                       print(x,y,z,w)

Примеры