a2-2ab+b2 - x(a+b)+y(a+b)  , (a-b) (a-b) - (a+b) (x+y), x2-y - 2a(m-2n)-b(m-2n) , (x-y) (x-y) - (m-2n) (2a-b), x+x2-xy2-y2 - (a+b), (x+1) (x-y2) - (a-b) (a-b),

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