K609 :

4*b^4*c^2*x^3 - 4*b^2*c^4*x^3 + a^4*c^2*x^2*y + 4*a^2*b^2*c^2*x^2*y -b^4*c^2*x^2*y - 2*a^2*c^4*x^2*y + c^6*x^2*y + a^4*c^2*x*y^2 -4*a^2*b^2*c^2*x*y^2 - b^4*c^2*x*y^2 + 2*b^2*c^4*x*y^2 - c^6*x*y^2 -4*a^4*c^2*y^3 + 4*a^2*c^4*y^3 - a^4*b^2*x^2*z + 2*a^2*b^4*x^2*z -b^6*x^2*z - 4*a^2*b^2*c^2*x^2*z + b^2*c^4*x^2*z + a^6*y^2*z -2*a^4*b^2*y^2*z + a^2*b^4*y^2*z + 4*a^2*b^2*c^2*y^2*z - a^2*c^4*y^2*z -a^4*b^2*x*z^2 + b^6*x*z^2 + 4*a^2*b^2*c^2*x*z^2 - 2*b^4*c^2*x*z^2 +b^2*c^4*x*z^2 - a^6*y*z^2 + a^2*b^4*y*z^2 + 2*a^4*c^2*y*z^2 -4*a^2*b^2*c^2*y*z^2 - a^2*c^4*y*z^2 + 4*a^4*b^2*z^3 - 4*a^2*b^4*z^3 = 0