K771 :b^4*c^5*x^2*y - a*b^2*c^6*x^2*y - a^4*c^5*x*y^2 + a^2*b*c^6*x*y^2 + a*b^6*c^2*x^2*z - b^5*c^4*x^2*z - a^6*b*c^2*y^2*z + a^5*c^4*y^2*z + a^4*b^5*x*z^2 -  a^2*b^6*c*x*z^2 - a^5*b^4*y*z^2 + a^6*b^2*c*y*z^2 = 0