Q181 :

a^3 b c^4 x^4 y^2-a b^3 c^4 x^4 y^2-a^2 b c^5 x^4 y^2-b^3 c^5 x^4 y^2-a b c^6 x^4 y^2+b c^7 x^4 y^2+2 a^3 b c^4 x^3 y^3-2 a b^3 c^4 x^3 y^3-2 a^2 b c^5 x^3 y^3+2 a b^2 c^5 x^3 y^3+a^3 b c^4 x^2 y^4-a b^3 c^4 x^2 y^4+a^3 c^5 x^2 y^4+a b^2 c^5 x^2 y^4+a b c^6 x^2 y^4-a c^7 x^2 y^4+2 a b^4 c^3 x^4 y z-2 b^5 c^3 x^4 y z-2 a b^3 c^4 x^4 y z+2 b^3 c^5 x^4 y z-2 a^4 b c^3 x^3 y^2 z-4 a^2 b^3 c^3 x^3 y^2 z+6 a b^4 c^3 x^3 y^2 z+2 a^3 b c^4 x^3 y^2 z-4 a b^3 c^4 x^3 y^2 z+2 a^2 b c^5 x^3 y^2 z-2 a b c^6 x^3 y^2 z-6 a^4 b c^3 x^2 y^3 z+4 a^3 b^2 c^3 x^2 y^3 z+2 a b^4 c^3 x^2 y^3 z+4 a^3 b c^4 x^2 y^3 z-2 a b^3 c^4 x^2 y^3 z-2 a b^2 c^5 x^2 y^3 z+2 a b c^6 x^2 y^3 z+2 a^5 c^3 x y^4 z-2 a^4 b c^3 x y^4 z+2 a^3 b c^4 x y^4 z-2 a^3 c^5 x y^4 z-a^3 b^4 c x^4 z^2+a^2 b^5 c x^4 z^2+a b^6 c x^4 z^2-b^7 c x^4 z^2+a b^4 c^3 x^4 z^2+b^5 c^3 x^4 z^2+2 a^4 b^3 c x^3 y z^2-2 a^3 b^4 c x^3 y z^2-2 a^2 b^5 c x^3 y z^2+2 a b^6 c x^3 y z^2+4 a^2 b^3 c^3 x^3 y z^2+4 a b^4 c^3 x^3 y z^2-6 a b^3 c^4 x^3 y z^2-2 a^6 b c x y^3 z^2+2 a^5 b^2 c x y^3 z^2+2 a^4 b^3 c x y^3 z^2-2 a^3 b^4 c x y^3 z^2-4 a^4 b c^3 x y^3 z^2-4 a^3 b^2 c^3 x y^3 z^2+6 a^3 b c^4 x y^3 z^2+a^7 c y^4 z^2-a^6 b c y^4 z^2-a^5 b^2 c y^4 z^2+a^4 b^3 c y^4 z^2-a^5 c^3 y^4 z^2-a^4 b c^3 y^4 z^2-2 a^3 b^4 c x^3 z^3+2 a^2 b^5 c x^3 z^3-2 a b^5 c^2 x^3 z^3+2 a b^4 c^3 x^3 z^3+6 a^4 b^3 c x^2 y z^3-4 a^3 b^4 c x^2 y z^3-2 a b^6 c x^2 y z^3-4 a^3 b^3 c^2 x^2 y z^3+2 a b^5 c^2 x^2 y z^3+2 a b^4 c^3 x^2 y z^3-2 a b^3 c^4 x^2 y z^3+2 a^6 b c x y^2 z^3+4 a^4 b^3 c x y^2 z^3-6 a^3 b^4 c x y^2 z^3-2 a^5 b c^2 x y^2 z^3+4 a^3 b^3 c^2 x y^2 z^3-2 a^4 b c^3 x y^2 z^3+2 a^3 b c^4 x y^2 z^3-2 a^5 b^2 c y^3 z^3+2 a^4 b^3 c y^3 z^3+2 a^5 b c^2 y^3 z^3-2 a^4 b c^3 y^3 z^3-a^3 b^5 x^2 z^4+a b^7 x^2 z^4-a^3 b^4 c x^2 z^4-a b^6 c x^2 z^4-a b^5 c^2 x^2 z^4+a b^4 c^3 x^2 z^4-2 a^5 b^3 x y z^4+2 a^3 b^5 x y z^4+2 a^4 b^3 c x y z^4-2 a^3 b^4 c x y z^4-a^7 b y^2 z^4+a^5 b^3 y^2 z^4+a^6 b c y^2 z^4+a^4 b^3 c y^2 z^4+a^5 b c^2 y^2 z^4-a^4 b c^3 y^2 z^4=0