expand a^2(b^2+bc+c^2)(c^2+ca+a^2)+b^2(a^2+ab+b^2)(c^2+ca+a^2)+c^2(a^2+ab+b^2)(b^2+bc+c^2)-(a^2+ab+b^2)(b^2+bc+c^2)(c^2+ca+a^2)

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