K861 :

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