K792 :

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