Q186 :

2 b^4 c^4 x^4 y^2-a^4 c^4 x^3 y^3+b^4 c^4 x^3 y^3+a^2 c^6 x^3 y^3-b^2 c^6 x^3 y^3-2 a^4 c^4 x^2 y^4-a^2 b^4 c^2 x^4 y z+b^6 c^2 x^4 y z+a^2 b^2 c^4 x^4 y z-b^2 c^6 x^4 y z+a^6 c^2 x^3 y^2 z+a^4 b^2 c^2 x^3 y^2 z-2 b^6 c^2 x^3 y^2 z-a^4 c^4 x^3 y^2 z+2 a^2 b^2 c^4 x^3 y^2 z-a^2 c^6 x^3 y^2 z+b^2 c^6 x^3 y^2 z+c^8 x^3 y^2 z+2 a^6 c^2 x^2 y^3 z-a^2 b^4 c^2 x^2 y^3 z-b^6 c^2 x^2 y^3 z-2 a^2 b^2 c^4 x^2 y^3 z+b^4 c^4 x^2 y^3 z-a^2 c^6 x^2 y^3 z+b^2 c^6 x^2 y^3 z-c^8 x^2 y^3 z-a^6 c^2 x y^4 z+a^4 b^2 c^2 x y^4 z-a^2 b^2 c^4 x y^4 z+a^2 c^6 x y^4 z-2 b^4 c^4 x^4 z^2-a^6 b^2 x^3 y z^2+a^4 b^4 x^3 y z^2+a^2 b^6 x^3 y z^2-b^8 x^3 y z^2-a^4 b^2 c^2 x^3 y z^2-2 a^2 b^4 c^2 x^3 y z^2-b^6 c^2 x^3 y z^2+2 b^2 c^6 x^3 y z^2+a^8 x y^3 z^2-a^6 b^2 x y^3 z^2-a^4 b^4 x y^3 z^2+a^2 b^6 x y^3 z^2+a^6 c^2 x y^3 z^2+2 a^4 b^2 c^2 x y^3 z^2+a^2 b^4 c^2 x y^3 z^2-2 a^2 c^6 x y^3 z^2+2 a^4 c^4 y^4 z^2+a^4 b^4 x^3 z^3-a^2 b^6 x^3 z^3+b^6 c^2 x^3 z^3-b^4 c^4 x^3 z^3-2 a^6 b^2 x^2 y z^3+a^2 b^6 x^2 y z^3+b^8 x^2 y z^3+2 a^2 b^4 c^2 x^2 y z^3-b^6 c^2 x^2 y z^3+a^2 b^2 c^4 x^2 y z^3-b^4 c^4 x^2 y z^3+b^2 c^6 x^2 y z^3-a^8 x y^2 z^3-a^6 b^2 x y^2 z^3+2 a^2 b^6 x y^2 z^3+a^6 c^2 x y^2 z^3-2 a^4 b^2 c^2 x y^2 z^3+a^4 c^4 x y^2 z^3-a^2 b^2 c^4 x y^2 z^3-a^2 c^6 x y^2 z^3+a^6 b^2 y^3 z^3-a^4 b^4 y^3 z^3-a^6 c^2 y^3 z^3+a^4 c^4 y^3 z^3+2 a^4 b^4 x^2 z^4+a^6 b^2 x y z^4-a^2 b^6 x y z^4-a^4 b^2 c^2 x y z^4+a^2 b^4 c^2 x y z^4-2 a^4 b^4 y^2 z^4=0