Q091 :
a^2*b^2*c^4*x^4*y + b^4*c^4*x^4*y - b^2*c^6*x^4*y + 4*a^2*b^2*c^4*x^3*y^2 - 2*b^4*c^4*x^3*y^2 + 2*b^2*c^6*x^3*y^2 + 2*a^4*c^4*x^2*y^3 - 4*a^2*b^2*c^4*x^2*y^3 - 2*a^2*c^6*x^2*y^3 - a^4*c^4*x*y^4 - a^2*b^2*c^4*x*y^4 + a^2*c^6*x*y^4 - a^2*b^4*c^2*x^4*z + b^6*c^2*x^4*z - b^4*c^4*x^4*z + 2*a^2*b^4*c^2*x^3*y*z - 2*b^6*c^2*x^3*y*z - 2*a^2*b^2*c^4*x^3*y*z + 2*b^2*c^6*x^3*y*z + 6*a^4*b^2*c^2*x^2*y^2*z - 6*a^2*b^4*c^2*x^2*y^2*z + 2*a^6*c^2*x*y^3*z - 2*a^4*b^2*c^2*x*y^3*z + 2*a^2*b^2*c^4*x*y^3*z - 2*a^2*c^6*x*y^3*z - a^6*c^2*y^4*z + a^4*b^2*c^2*y^4*z + a^4*c^4*y^4*z - 4*a^2*b^4*c^2*x^3*z^2 - 2*b^6*c^2*x^3*z^2 + 2*b^4*c^4*x^3*z^2 - 6*a^4*b^2*c^2*x^2*y*z^2 + 6*a^2*b^2*c^4*x^2*y*z^2 + 6*a^2*b^4*c^2*x*y^2*z^2 - 6*a^2*b^2*c^4*x*y^2*z^2 + 2*a^6*c^2*y^3*z^2 + 4*a^4*b^2*c^2*y^3*z^2 - 2*a^4*c^4*y^3*z^2 - 2*a^4*b^4*x^2*z^3 + 2*a^2*b^6*x^2*z^3 + 4*a^2*b^4*c^2*x^2*z^3 - 2*a^6*b^2*x*y*z^3 + 2*a^2*b^6*x*y*z^3 + 2*a^4*b^2*c^2*x*y*z^3 - 2*a^2*b^4*c^2*x*y*z^3 - 2*a^6*b^2*y^2*z^3 + 2*a^4*b^4*y^2*z^3 - 4*a^4*b^2*c^2*y^2*z^3 + a^4*b^4*x*z^4 - a^2*b^6*x*z^4 + a^2*b^4*c^2*x*z^4 + a^6*b^2*y*z^4 - a^4*b^4*y*z^4 - a^4*b^2*c^2*y*z^4 = 0