[If] there is a corpse in a house with numerous entrances, all [utensils in the en-trances] become tamei. [If] one [door] is opened, it is tamei, and the others are tahor. [If] it was decided to remove [the corpse] through one of the [doors], or through a window four handbreadths square, tumah is curtailed from all the other entrances. Beis Shammai say: It must be decided before the person dies. Beis Hillel say: [It can be decided] even after the person dies. If [an entrance] was sealed and he decided to open it — Beis Shammai say: When he opens four handbreadths [it will curtail tumah from the other entrances]; but Beis Hillel say: As soon as he begins [to open it]. But they [both] agree that a doorway created for the first time must be opened four handbreadths.