Any of the items that convey tumah through ohel, that were divided and brought in-to a house, R’ Dosa ben Harkinas rules [him] tahor, while the Sages rule [him] tamei. How so? [If] someone touches two pieces of [animal] carcass, each [one] half the size of an olive, or carries them; or, [in the case of] a corpse, if someone touches [a piece of flesh] half the size of an olive and [simultaneously] forms a roof over [an-other] piece half the size of an olive; or he touches [a piece of flesh] half the size of an olive, and [another piece] half the size of an olive forms a roof over him; or he forms a roof over two pieces, each half the size of an olive; or the person forms a roof over [a piece of corpse] half the size of an olive, and a piece half the size of an olive forms a roof over him, R’ Dosa ben Harkinas rules [him] tahor, while the Sages rule [him] tamei. But [if] someone touches [a piece of corpse flesh] half the size of an olive and [simultaneously] something forms a roof over him and [a different piece of corpse flesh] half the size of an olive, or one forms a roof over a piece [of corpse flesh] half the size of an olive and [simultaneously] something forms a roof over him and [a dif-ferent piece of corpse flesh] half the size of an olive, he remains tahor. R’ Meir said: Even in this case R’ Dosa ben Harkinas rules [him] tahor and the Sages rule [him] tamei. Everyone becomes tamei [in the above situations] except [where tumah contracted through] touch coincides with [tumah contracted through] carrying, and [the cases in which tumah contracted through] carrying coincides with [tumah contracted through] ohel. This is the rule: Anything in the same category is tamei; whereas those in dif-ferent categories remain tahor.