More on adding to the city of Jerusalem or the Temple courtyard - where Rav Nachman says one of the factors listed in the mishnah is necessary (as compared to all of them). With the question of lasting sanctification or resanctification, in the time of Ezra and Nechemiah's return to Zion. Note differences between the First Temple and the Second Temple. Also, the question of shifts in status (in terms of impurity upon entry, or thereafter) between the Mishkan (Tabernacle) and the Mikdash (Temple).