Who's Who: The Baalei HaTosafot. What they do, and why they're here, on the daf. Plus, what one of these long comments by the Baalei HaTosafot has to say on our daf, specifically, on "yesh bereira" or not. Specifically, in the context of terumot and maaserot with Samaritans. With a pile of passages from the Gemara to support the claims of who holds what...