\[\begin{Bmatrix}j_{11}&j_{12}&j_{13}\\
j_{21}&j_{22}&j_{13}\\
j_{31}&j_{31}&0\end{Bmatrix}=\frac{(-1)^{j_{12}+j_{21}+j_{13}+j_{31}}}{((2j_{1%
3}+1)(2j_{31}+1))^{\frac{1}{2}}}\begin{Bmatrix}j_{11}&j_{12}&j_{13}\\
j_{22}&j_{21}&j_{31}\end{Bmatrix}.\]