Q173 :

a b^6 c^4 x^4 y^2-b^7 c^4 x^4 y^2+4 a b^5 c^5 x^4 y^2-3 b^6 c^5 x^4 y^2+6 a b^4 c^6 x^4 y^2-2 b^5 c^6 x^4 y^2+4 a b^3 c^7 x^4 y^2+2 b^4 c^7 x^4 y^2+a b^2 c^8 x^4 y^2+3 b^3 c^8 x^4 y^2+b^2 c^9 x^4 y^2-2 a^3 b^3 c^5 x^3 y^3-4 a^3 b^2 c^6 x^3 y^3-4 a^2 b^3 c^6 x^3 y^3-2 a^3 b c^7 x^3 y^3-8 a^2 b^2 c^7 x^3 y^3-2 a b^3 c^7 x^3 y^3-4 a^2 b c^8 x^3 y^3-4 a b^2 c^8 x^3 y^3-2 a b c^9 x^3 y^3-a^7 c^4 x^2 y^4+a^6 b c^4 x^2 y^4-3 a^6 c^5 x^2 y^4+4 a^5 b c^5 x^2 y^4-2 a^5 c^6 x^2 y^4+6 a^4 b c^6 x^2 y^4+2 a^4 c^7 x^2 y^4+4 a^3 b c^7 x^2 y^4+3 a^3 c^8 x^2 y^4+a^2 b c^8 x^2 y^4+a^2 c^9 x^2 y^4-2 a b^7 c^3 x^4 y z-8 a b^6 c^4 x^4 y z-12 a b^5 c^5 x^4 y z-8 a b^4 c^6 x^4 y z-2 a b^3 c^7 x^4 y z-2 a^3 b^5 c^3 x^3 y^2 z+4 a b^7 c^3 x^3 y^2 z+8 a b^6 c^4 x^3 y^2 z+6 a^3 b^3 c^5 x^3 y^2 z+4 a^2 b^4 c^5 x^3 y^2 z+2 a b^5 c^5 x^3 y^2 z+4 a^3 b^2 c^6 x^3 y^2 z+8 a^2 b^3 c^6 x^3 y^2 z-4 a b^4 c^6 x^3 y^2 z+4 a^2 b^2 c^7 x^3 y^2 z-2 a b^3 c^7 x^3 y^2 z+4 a^7 b c^3 x^2 y^3 z-2 a^5 b^3 c^3 x^2 y^3 z+8 a^6 b c^4 x^2 y^3 z+2 a^5 b c^5 x^2 y^3 z+4 a^4 b^2 c^5 x^2 y^3 z+6 a^3 b^3 c^5 x^2 y^3 z-4 a^4 b c^6 x^2 y^3 z+8 a^3 b^2 c^6 x^2 y^3 z+4 a^2 b^3 c^6 x^2 y^3 z-2 a^3 b c^7 x^2 y^3 z+4 a^2 b^2 c^7 x^2 y^3 z-2 a^7 b c^3 x y^4 z-8 a^6 b c^4 x y^4 z-12 a^5 b c^5 x y^4 z-8 a^4 b c^6 x y^4 z-2 a^3 b c^7 x y^4 z+a b^8 c^2 x^4 z^2+b^9 c^2 x^4 z^2+4 a b^7 c^3 x^4 z^2+3 b^8 c^3 x^4 z^2+6 a b^6 c^4 x^4 z^2+2 b^7 c^4 x^4 z^2+4 a b^5 c^5 x^4 z^2-2 b^6 c^5 x^4 z^2+a b^4 c^6 x^4 z^2-3 b^5 c^6 x^4 z^2-b^4 c^7 x^4 z^2+4 a^3 b^6 c^2 x^3 y z^2+4 a^2 b^7 c^2 x^3 y z^2+6 a^3 b^5 c^3 x^3 y z^2+8 a^2 b^6 c^3 x^3 y z^2-2 a b^7 c^3 x^3 y z^2+4 a^2 b^5 c^4 x^3 y z^2-4 a b^6 c^4 x^3 y z^2-2 a^3 b^3 c^5 x^3 y z^2+2 a b^5 c^5 x^3 y z^2+8 a b^4 c^6 x^3 y z^2+4 a b^3 c^7 x^3 y z^2-6 a^7 b^2 c^2 x^2 y^2 z^2-6 a^6 b^3 c^2 x^2 y^2 z^2+2 a^5 b^4 c^2 x^2 y^2 z^2+2 a^4 b^5 c^2 x^2 y^2 z^2-6 a^3 b^6 c^2 x^2 y^2 z^2-6 a^2 b^7 c^2 x^2 y^2 z^2-6 a^6 b^2 c^3 x^2 y^2 z^2-8 a^5 b^3 c^3 x^2 y^2 z^2-10 a^4 b^4 c^3 x^2 y^2 z^2-8 a^3 b^5 c^3 x^2 y^2 z^2-6 a^2 b^6 c^3 x^2 y^2 z^2+2 a^5 b^2 c^4 x^2 y^2 z^2-10 a^4 b^3 c^4 x^2 y^2 z^2-10 a^3 b^4 c^4 x^2 y^2 z^2+2 a^2 b^5 c^4 x^2 y^2 z^2+2 a^4 b^2 c^5 x^2 y^2 z^2-8 a^3 b^3 c^5 x^2 y^2 z^2+2 a^2 b^4 c^5 x^2 y^2 z^2-6 a^3 b^2 c^6 x^2 y^2 z^2-6 a^2 b^3 c^6 x^2 y^2 z^2-6 a^2 b^2 c^7 x^2 y^2 z^2+4 a^7 b^2 c^2 x y^3 z^2+4 a^6 b^3 c^2 x y^3 z^2-2 a^7 b c^3 x y^3 z^2+8 a^6 b^2 c^3 x y^3 z^2+6 a^5 b^3 c^3 x y^3 z^2-4 a^6 b c^4 x y^3 z^2+4 a^5 b^2 c^4 x y^3 z^2+2 a^5 b c^5 x y^3 z^2-2 a^3 b^3 c^5 x y^3 z^2+8 a^4 b c^6 x y^3 z^2+4 a^3 b c^7 x y^3 z^2+a^9 c^2 y^4 z^2+a^8 b c^2 y^4 z^2+3 a^8 c^3 y^4 z^2+4 a^7 b c^3 y^4 z^2+2 a^7 c^4 y^4 z^2+6 a^6 b c^4 y^4 z^2-2 a^6 c^5 y^4 z^2+4 a^5 b c^5 y^4 z^2-3 a^5 c^6 y^4 z^2+a^4 b c^6 y^4 z^2-a^4 c^7 y^4 z^2-2 a^3 b^7 c x^3 z^3-4 a^2 b^8 c x^3 z^3-2 a b^9 c x^3 z^3-4 a^3 b^6 c^2 x^3 z^3-8 a^2 b^7 c^2 x^3 z^3-4 a b^8 c^2 x^3 z^3-2 a^3 b^5 c^3 x^3 z^3-4 a^2 b^6 c^3 x^3 z^3-2 a b^7 c^3 x^3 z^3+4 a^7 b^3 c x^2 y z^3+8 a^6 b^4 c x^2 y z^3+2 a^5 b^5 c x^2 y z^3-4 a^4 b^6 c x^2 y z^3-2 a^3 b^7 c x^2 y z^3+4 a^4 b^5 c^2 x^2 y z^3+8 a^3 b^6 c^2 x^2 y z^3+4 a^2 b^7 c^2 x^2 y z^3-2 a^5 b^3 c^3 x^2 y z^3+6 a^3 b^5 c^3 x^2 y z^3+4 a^2 b^6 c^3 x^2 y z^3-2 a^7 b^3 c x y^2 z^3-4 a^6 b^4 c x y^2 z^3+2 a^5 b^5 c x y^2 z^3+8 a^4 b^6 c x y^2 z^3+4 a^3 b^7 c x y^2 z^3+4 a^7 b^2 c^2 x y^2 z^3+8 a^6 b^3 c^2 x y^2 z^3+4 a^5 b^4 c^2 x y^2 z^3+4 a^6 b^2 c^3 x y^2 z^3+6 a^5 b^3 c^3 x y^2 z^3-2 a^3 b^5 c^3 x y^2 z^3-2 a^9 b c y^3 z^3-4 a^8 b^2 c y^3 z^3-2 a^7 b^3 c y^3 z^3-4 a^8 b c^2 y^3 z^3-8 a^7 b^2 c^2 y^3 z^3-4 a^6 b^3 c^2 y^3 z^3-2 a^7 b c^3 y^3 z^3-4 a^6 b^2 c^3 y^3 z^3-2 a^5 b^3 c^3 y^3 z^3-a^7 b^4 x^2 z^4-3 a^6 b^5 x^2 z^4-2 a^5 b^6 x^2 z^4+2 a^4 b^7 x^2 z^4+3 a^3 b^8 x^2 z^4+a^2 b^9 x^2 z^4+a^6 b^4 c x^2 z^4+4 a^5 b^5 c x^2 z^4+6 a^4 b^6 c x^2 z^4+4 a^3 b^7 c x^2 z^4+a^2 b^8 c x^2 z^4-2 a^7 b^3 c x y z^4-8 a^6 b^4 c x y z^4-12 a^5 b^5 c x y z^4-8 a^4 b^6 c x y z^4-2 a^3 b^7 c x y z^4+a^9 b^2 y^2 z^4+3 a^8 b^3 y^2 z^4+2 a^7 b^4 y^2 z^4-2 a^6 b^5 y^2 z^4-3 a^5 b^6 y^2 z^4-a^4 b^7 y^2 z^4+a^8 b^2 c y^2 z^4+4 a^7 b^3 c y^2 z^4+6 a^6 b^4 c y^2 z^4+4 a^5 b^5 c y^2 z^4+a^4 b^6 c y^2 z^4=0