A new mishnah! (from 104) With a case of contradictory measurements (specific and approximate), which is a complication for an effective sale - the one nullifies the other. Plus, a story that took place in the Galil - with the rental of a place for the year, 1 gold dinar per month. But then the year was declared a leap year - with an extra month. Should that be paid for as an independent month or divide it so that the 12 dinars of the year are spread out? Also, the language of a coin (istera) that's worth 96 copper coins vs. the language of 100 copper coins - which calls on the buyers and sellers to be precise - and yet people are often imprecise in exactly this kind of transaction. So the Gemara addresses which is meant when the vagaries of expression are in place. And it uses the leap year rental as a proof -- except not quite.