(6−a)(4a+1)(6-a)(4 a+1)(6−a)(4a+1)
(a−6)(4a+1)(a-6)(4 a+1)(a−6)(4a+1)
(a−6)(4a−1)(a-6)(4 a-1)(a−6)(4a−1)
(6−a)(4a−1)(6-a)(4 a-1)(6−a)(4a−1)
