Nedarim 5: When Are Inconclusive, Ambiguous Statements Valid?
First, Shmuel's understanding of the mishnah. Also, partial declarations, and when they count as binding and when they don't, especially with regard to the bill of divorce... and nezirut. And the dispute between Abaye and Rava on these statements, and how each can be read to line up with the defense of the opposite position too.