a2+2ab+b2 - (a+b)2, a2-2ab+b2 - (a-b)2, (a-b)(a+b) - (a2-b2), a3+3a2b+3ab2+b3 - (a+b)3, a3-3a2b+3ab2-b3 - (a-b)3, (a - b) (a2 + ab + b2) - (a3-b3),

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