1, -a(a-2)(a-6)
2, (x-7)(2x-1)
3, (3a-2)(a-2)
4, (x+2)(5x-3)
5, 2(x-1)(3x-5)
2, (x-7)(2x-1)
3, (3a-2)(a-2)
4, (x+2)(5x-3)
5, 2(x-1)(3x-5)
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