static const string srep("\
792*z^8*w^4*x^3*y^4*u^7 + 24*z^4*w^4*x^2*y^3*u^4 \
-+ 264*z^8*w^3*x^2*y^7*u^5 + 198*z^4*w^5*x^5*y*u^6 \
-+ 110*z^2*w^3*x^5*y^4*u^6 - 120*z^8*w*x^4*u^6 \
++ 264*z^8*w^3*x^2*y^7*u^5 + 198*z^4*w^5*x^5*y*u^6 \
++ 110*z^2*w^3*x^5*y^4*u^6 - 120*z^8*w*x^4*u^6 \
- 480*z^5*w*x^4*y^6*u^8 - 720*z^7*x^3*y^3*u^7 \
+ 165*z^4*w^2*x^4*y*u^5 + 450*z^8*w^6*x^2*y*u^8 \
+ 40*z^2*w^3*x^3*y^3*u^6 - 288*z^7*w^2*x^3*y^6*u^6 \