 \langle \alpha_0 | r_0,s_0 \rangle \langle r_0,s_0 | \alpha_0 \rangle \langle \alpha_0 | r_0,s_0 \rangle \langle r_0,s_0| \alpha_0 \rangle - \langle \alpha_0 | r_0,s_0 \rangle \langle r_0,s_0 | \alpha_0 \rangle \langle \alpha_0 | r_0,s_0 \rangle \langle r_0,s_0| \alpha_0 \rangle - \langle \alpha_0 | r_0,s_0 \rangle \langle r_0,s_0| \alpha_0 \rangle \langle \alpha_0 | r_0,s_0 \rangle \langle r_0,s_0| \alpha_0 \rangle 