(x+a)(ax+1)(x+a)(a x+1)(x+a)(ax+1)
(x−a)(ax−1)(x-a)(a x-1)(x−a)(ax−1)
(a+1)(ax+1)(a+1)(a x+1)(a+1)(ax+1)
(x+1)(ax+1)(x+1)(a x+1)(x+1)(ax+1)
