K1078 :

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