K1258 :

b^4 c^6 x^2 y+b^2 c^8 x^2 y-a^4 c^6 x y^2-a^2 c^8 x y^2-b^8 c^2 x^2 z-b^6 c^4 x^2 z+a^8 c^2 y^2 z+a^6 c^4 y^2 z+a^4 b^6 x z^2+a^2 b^8 x z^2-a^8 b^2 y z^2-a^6 b^4 y z^2=0