In the wake of the discussion between Rabbi Yochanan and Rabbi Yehuda, the gemara finds a contradiction of sorts in the mishna and resolves it. The mishna discusses the order of inheritance – if one is not alive, it first goes to their descendants before it continues to the next level. There was a big debate between the Tzedukim and the Rabbis about a case where there are 2 siblings – a son and daughter but the son is no longer alive and his daughter precedes his sister for their father’s inheritance. The Tzedukim say that the sister and the granddaughter split it 50/50. Rabban Yochanan ben Zakkai debates them and wins and sets the law according to traditional halacha.