K866 :

a^4 b^3 c^8 x^2 y-b^5 c^10 x^2 y-a^3 b^4 c^8 x y^2+a^5 c^10 x y^2-a^4 b^8 c^3 x^2 z+b^10 c^5 x^2 z+a^8 b^4 c^3 y^2 z-a^10 c^5 y^2 z-a^5 b^10 x z^2+a^3 b^8 c^4 x z^2+a^10 b^5 y z^2-a^8 b^3 c^4 y z^2=0