[If] a scribe wrote a get for a man and a receipt for a woman, and he erred and gave the get to the woman and the receipt to the man, and they gave [them] one to another, and afterward, the get was found in the hand of the man and the receipt in the hand of the woman, she must leave both of them, and all of these procedures apply to her. R' Eliezer says: If it went out immediately, it is not a get; if it went out afterward, it is a get, [because] the first is not believed to abrogate the rights of the second.  [If a man] wrote [a get] to divorce his wife and [then] changed his mind —- Beis Shammai say: He disqualified her from marrying a Kohen; Beis Hillel, however, say: Even if he gave it to her on a condition, and the condition was not met, he did not disqualify her from marrying a Kohen.