Two boxes or two storerooms, [and] a seah of terumah fell into one of them but it is not known into which of them it fell, they nullify each other. R' Shimon says: Even if they are in two cities, they cause each other to be raised up.

[If] a seah of terumah fell into the opening of a storehouse, and he skimmed it, R' Eliezer says: If the skimmed layer contains one hundred seah, it can be raised up in one hundred and one. However, R' Yehoshua says: It cannot be raised up. [If] a seah of terumah fell into the mouth of a storehouse, he should skim it off. If so, why did they say: Terumah is raised up in one hun-dred and one? Where it is not known if they were mixed, or into where it fell.