I'm in the process of rewiring a bedroom and would like to switch the bottom plug of a duplex receptacle. The switch will be at the end of the run of the circuit. There are n receptacles in the run and the one I want switch is the n-1 receptacle. I've seen diagrams on how to switch the nth receptacle when the switch is at the run but need some confirmation on switching the n-1th receptacle. I believe I would need a 3 wire from the n-1th to the nth receptacle, then another 3 wire from the nth to the switch. Is this correct? Thanks for your help.