x²+2xy+y² - (x+y)², x²-2xy+y² - (x-y)², 6x²+12x+6 - (2x+2)(3x+3), 6x²-13x+6 - (3x-2)(2x-3), x²+5x+6 - (x+2)(x+3), x²+3x-10 - (x+5)(x-2), (x-3)(x-4) - x²-7x+12, x(y-2) - xy-2x, y(y-2x) - y²-2xy, (x-2)(x+3) - x²+x-6, -4y(2-3x) - -8y+12xy, 2y(3-4y) - 6y-8y²,

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