r^4*s^3 - 6*r^4*s^2 + 9*r^4*s - r^4 + r^3*s^5 - 7*r^3*s^4 + 20*r^3*s^3 - 19*r^3*s^2 - 8*r^3*s + r^3 + r^2*s^4 - 11*r^2*s^3 + 28*r^2*s^2 + r*s^4 - 5*r*s^3 - 8*r*s^2 + s^4 + s^3 + s^2