K863 :

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