expand (1/12)((R+G+B)^6 + (R^2+G^2+B^2)^3 + 2*(R^3+G^3+B^3)^2 + 2*(R^6+G^6+B^6) + 3*(R^2+G^2+B^2)^3 + 3*(R+G+B)^2(R^2+G^2+B^2)^2)

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