Use the surface integral $o{\displaystyle \underset{C}{\overset{\phantom{}}{}}}$vec$(F)*dvec(r)$ in Stokes' Theorem to calculate the circulation of the field vec$(F)=(y^2+z^2)vec(i)+(x^2+y^2)vec(j)+(x^2+y^2)vec(k)$ around the curve $C$ where $C$ is a square bounded by the lines $x=+-9$ and $y=+-9$ in the $xy-$plane oriented counterclockwise when viewed from above.