K1385 :

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