On the ways to write documents, especially those used to effect transfer -- including if the document is written in a different place from that actual transfer of property. Plus, the scribe's responsibility not only with regard to the writing of the words, but also to the writing of it. Also, a new mishnah! A case of two brothers: 1 wealthy, 1 poor. Their father leaves them property that was used to make a profit. Plus, the case of two parties with the same name -- for example, Yosef bar Shimon.... Also, an incident about a document attesting to a lender borrowing funds, but there's no identifying name for the creditor. Which would cause a whole host of problems if the document itself were treated as valid (which it just might be, if there were witnesses).