(y-9)^2, 2 (b-c-10a), -b (a+7), (d-a)^2, -4 (y-c), (y+2)^2, - 4 (c-a), (-3-x)^2, (e+4) (e-4), (7+a) (7-a), (2+d) (2-d), (5-y)^2.

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