(a+b)^2 = 2C0*a^2 + 2C1*ab +2C2b^2

    (a+b)^3 = 3C0*a^3 + 3C1*a^2b + 3C2*a^3b^2 + 3C3*b^3

    (a+b)^4 = 4C0*a^4 + 4C1*a^3b + 4C2*a^2b^2 + 4C3*ab^3 + 4C4*b^4



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