P_{0,0}+P_{0,0})+O(0),\end{aligned}$$  where  $$\begin{aligned} P_{0,0}={\mathbf}C_0^0{\mathbf}C_0^0{\mathbf}C_0^0\sum_{i_0,\cdots,i_0,j_0,\cdots, j_0}a_{i_0,j_0}^0a_{i_0,j_0}a_{i_0,j_0}a_{i_0,j_0}a_{i_0,j_0}a_{i_0,j_0}^0 =00