We may not separate terumah from an item whose processing is completed on behalf of an item whose processing is not com-pleted, nor from an item whose processing is not completed on behalf of an item whose processing is completed, nor from an item whose processing is not completed on behalf of an item whose processing is not completed. But if they separated te-rumah [thus], their terumah is terumah.

We may not separate terumah from tahor [produce] on behalf of tamei [produce]. But if they separated terumah [thus], their terumah is terumah. In truth, they said: [Regarding] a round cake of pressed figs part of which became tamei, one may separate terumah from the tahor [figs] it contains on behalf of the tamei [figs] it contains, and likewise for a bundle of vegetables, and likewise for a pile [of produce]. If there were two round cakes [of figs], two bundles [of vegetables], or two piles [of produce], one [of which is] tamei and one [of which is] tahor, one may not separate terumah from this [one] on behalf of that [one].  Rab-bi Eliezer says: We may separate terumah from tahor [produce] on behalf of tamei [produce].