(x+1)(x+6), x²+7x+6, (x+1)(x-1), x² - 1, (x+3)(x+3), x²+6x+9, (x+5)(x+5), x²+10x+25, (x+6)(x+2), x²+8x+12, (x-1)(x+6), x²+5x-6, (x+6)(x-6), x²-36, (x-6)(x-6), x²-12x+36.

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