A long beraita that is brought into the discussion of when betrothal with a portion of some sanctified or dedicated portion works, or doesn't. Plus, how this parallel text to our Gemara is relevant to understand the differences of opinion. Also, more analysis of the cases of the mishnah - specifically, using the second tithe (maaser sheni) for betrothal. In contrast to other gifts to God/kohanim, which are effective for betrothal.