A new mishnah! Can a couple that divorces remarry each other? How does that affect yibum? And a other mishnah: A case of two brothers who are married to two minor sisters. What happens in the case of one of the brother's death (if he dies without children)? Likewise, the case of deaf-mute women. Namely, rabbinic kiddushin. But an adult and a minor mixes things up. Also, the sages take on more detailed cases, including refusal, which isn't necessarily encouraged. Plus, a message to judges, and how careful they must be.