Found documents (eg, promissory notes) that show a lien on property - in the Gemara's commentary on the mishnah, trying to determine the specifics of the case of the mishnah. Plus, the impact of the case of the loan - where the document calls it into question. Plus, R. Eleazar and R. Yochanan dispute how to understand the dispute between R. Meir and the sages, about the promissory note.