r^3 - r^2*s^5 + 7*r^2*s^4 - 18*r^2*s^3 + 19*r^2*s^2 - 10*r^2*s - r*s^5 + 4*r*s^4
    - 5*r*s^2 + 5*r*s - s^5 + s^4 - s^3 + s^2 - s