x2 + 6x + 9 - (x + 3)2, 4x2 + 20x + 25 - (2x + 5)2, x2 - 8x + 16 - (x - 4)2, 9x2 - 12x + 4 - (3x - 2)2, x2 - 25 - (x + 5)(x - 5), y2 - 16 - (y + 4)(y - 4), 4u2 -36yu + 81y2 - (2u-9y)2, x2 + 5x + 6 - (x + 2)(x + 3), 100x2 + 200x + y2 - (10x + y)2, 9x2y2 -42xyx + 49 - (3x - 7)2, y2 -9 - (y + 3)(y -3), 16x2-64x+64 - (4x-8)2, 81y2-36u2 - (9y-6u)(9y+6u), 196x2y2+420xyz+225z2 - (14xy+15z)2, 81p2-216pw+144w2 - (9p-12w)2,

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