1.a^2b^2-4ab+42.16-8xy+x^2y^23.(x+y)^2+6(x+y)+94.a^2-2a(b+c)+(b+c)^25.3-6x+3x^26.x^5-x^3y^27.16x^5+8x^3y^2+xy^48.16x^4-y^4
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