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\section{Combination}  If we then have some matrix of individual particle states corresponding to $\phi_{nm}=phi_m(r_n)$  \begin{equation} A=\begin{bmatrix}   \phi_{11} & \phi_{12} & \phi_{13} \\ \phi_{21} & \phi_{22} & \phi_{23} \\ \phi_{31} & \phi_{32} & \phi_{33}