{\rm {\mathcal S}}\left(\zeta \left(\pi _{S} \right)\right)} \left\langle \zeta ^{*} \left(\pi _{S} \right),Z_{R_{j} } \left(\pi _{S} \right)\right\rangle ,$$ where ${\rm {\mathcal S}}\left(\zeta \left(\pi _{S} \right)\right)$ is the set of all possible $N!$ entanglement swapping operations