(Mishnah) (R. Meir): If one buys from the wholesaler (who buys from bakers), he must tithe from each shape.

(R. Yehuda): He can tithe from one for all. And R. Yehuda agrees that if you buy from the Manpul, he must tithe from each and every one.

(Gemara): R. Meir reasons that a wholesaler buys from a number of bakers who each sell their own shape. (So within the same shape, tithing is permitted; but not from shape to shape.)

R. Yehuda reasons that a baker uses a number of shapes and a wholesaler buys from one baker.

Question: What is a Manpul?

(D'Bei R. Yannai): If there are 9 wholesalers and 10 bakers (in the city) - 8 wholesalers buy from 8 bakers and the 9th wholesaler (known as the Manpul) buys from 2 bakers. Therefore, (even according to R. Yehuda,) since it is not known which wholesaler is the Manpul, all must be viewed as such and a buyer must tithe each loaf from whoever he buys.

If (all of the other wholesalers have one shape and) this one has two shapes in front of him, he shows himself to be the one who buys from two bakers.

Question: If all bakers then began making the same shape, do we say that he has already proven himself to buy from two, so that when buying from the other wholesalers, one may tithe one loaf for all of them; or must he still tithe from each and every loaf when buying from all of the wholesalers?

Question (R. Yona): Just as you say that if there are 9 wholesalers and 10 bakers (in the city) - 8 wholesalers buy from 8 bakers and the 9th wholesaler buys from 2 bakers; so too if there are 9 bakers and 10 wholesalers, do we say that 8 wholesalers buy from 8 bakers and two wholesalers buy from one baker - so that every wholesaler only bought from one baker and one tithe can be made from all that the wholesaler sold. Or alternatively, do we say that 9 wholesalers bought from 9 bakers and the 10th wholesaler bought from all of the bakers, and since we do not know which wholesaler did this, Maaser must be taken from each and every loaf...? (The Gemara does not answer these two questions.)