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1) a+b+a^2-b^2
2) 9a^2-6ab+b^2-16
3) x^3y^2-x^3-xy^2+x
4) 1-x^2+4xy-4y^2
1) a+b+a^2-b^2
2) 9a^2-6ab+b^2-16
3) x^3y^2-x^3-xy^2+x
4) 1-x^2+4xy-4y^2
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