[If] the first [baby] was born dead and the second alive, [the living baby] is tahor. [If] the first [baby] was alive and the second dead, the [living baby] is tamei. R’ Meir says: [If they are in] one fetal sac, [the living baby] becomes tamei; however, [if they are in] two fetal sacs, the [living baby] is tahor.

[If] two sealed barrels, each containing a [piece of corpse] the size of half an olive, are located inside a house, [the barrels] remain tahor, but the house becomes tamei. [If] one of [the barrels] was opened, [that barrel] and the room are tamei, [but the other barrel] remains tahor. A similar [ruling] applies to two chambers that open into a room.