K650 :
a^4*b^2*x^3 - b^6*x^3 - a^4*c^2*x^3 + 3*b^4*c^2*x^3 - 3*b^2*c^4*x^3 + c^6*x^3 + 5*a^6*x^2*y - 10*a^4*b^2*x^2*y + 11*a^2*b^4*x^2*y - 6*b^6*x^2*y + a^4*c^2*x^2*y - 8*a^2*b^2*c^2*x^2*y + 9*b^4*c^2*x^2*y - 3*a^2*c^4*x^2*y - 3*c^6*x^2*y + 6*a^6*x*y^2 - 11*a^4*b^2*x*y^2 + 10*a^2*b^4*x*y^2 - 5*b^6*x*y^2 - 9*a^4*c^2*x*y^2 + 8*a^2*b^2*c^2*x*y^2 - b^4*c^2*x*y^2 + 3*b^2*c^4*x*y^2 + 3*c^6*x*y^2 + a^6*y^3 - a^2*b^4*y^3 - 3*a^4*c^2*y^3 + b^4*c^2*y^3 + 3*a^2*c^4*y^3 - c^6*y^3 - 5*a^6*x^2*z - a^4*b^2*x^2*z + 3*a^2*b^4*x^2*z + 3*b^6*x^2*z + 10*a^4*c^2*x^2*z + 8*a^2*b^2*c^2*x^2*z - 11*a^2*c^4*x^2*z - 9*b^2*c^4*x^2*z + 6*c^6*x^2*z - 28*a^4*b^2*x*y*z + 28*a^2*b^4*x*y*z + 28*a^4*c^2*x*y*z - 28*b^4*c^2*x*y*z - 28*a^2*c^4*x*y*z + 28*b^2*c^4*x*y*z - 3*a^6*y^2*z - 3*a^4*b^2*y^2*z + a^2*b^4*y^2*z + 5*b^6*y^2*z - 8*a^2*b^2*c^2*y^2*z - 10*b^4*c^2*y^2*z + 9*a^2*c^4*y^2*z + 11*b^2*c^4*y^2*z - 6*c^6*y^2*z - 6*a^6*x*z^2 + 9*a^4*b^2*x*z^2 - 3*b^6*x*z^2 + 11*a^4*c^2*x*z^2 - 8*a^2*b^2*c^2*x*z^2 - 3*b^4*c^2*x*z^2 - 10*a^2*c^4*x*z^2 + b^2*c^4*x*z^2 + 5*c^6*x*z^2 + 3*a^6*y*z^2 - 9*a^2*b^4*y*z^2 + 6*b^6*y*z^2 + 3*a^4*c^2*y*z^2 + 8*a^2*b^2*c^2*y*z^2 - 11*b^4*c^2*y*z^2 - a^2*c^4*y*z^2 + 10*b^2*c^4*y*z^2 - 5*c^6*y*z^2 - a^6*z^3 + 3*a^4*b^2*z^3 - 3*a^2*b^4*z^3 + b^6*z^3 + a^2*c^4*z^3 - b^2*c^4*z^3 = 0