(x−y−1)(x−y+1)(x-y-1)(x-y+1)(x−y−1)(x−y+1)
(x−y+1)(x+y−1)(x-y+1)(x+y-1)(x−y+1)(x+y−1)
(x+y+1)(x−y−1)(x+y+1)(x-y-1)(x+y+1)(x−y−1)
(x−y)(x+y+1)(x-y)(x+y+1)(x−y)(x+y+1)
