1. After an erasure, the text has to continue for at least another two lines.
2. Even for a simple document, the text has to continue for two lines since the last line simply contains the formula stating the validity of the preceding text, which cannot serve as a confirmation.
3. Both an erasure and an insertion by writing between lines must be referred to in the continuing text.
4. Rav prescribes the formula: “this is confirmation of [erasure/insertion] x”. The same is required in the Babli, 161b, in the name of R. Joḥanan.
5. Cf. Giṭṭin 7:6, Notes 133–139. The name of “contract”, τὸ σύμφωνον, is given to the contract stating a conditional preliminary marriage. If the groom satisfies the condition within a certain time frame, the preliminary marriage is valid from the moment of signing the contract. If he fails to satisfy the condition in the pre-established time frame, the woman is not preliminarily married and may marry any other man.
6. Since they already had formulated all the financial terms of the marriage, they preferred to erase the mention of symphon in the final summary, which automatically made the symphon clause unenforceable, instead of inserting between the lines a note annulling the symphon clause.
7. The insertion would have required another lengthening of the document by a text confirming the insertion.