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

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