On consecrated items and ritually impure items -- and how they are not treated the same in halakhah with regard to their prohibited use and their respective liabilities. Plus, the specific properties of food in its capacity to be rendered impure. Plus, the timing of the sprinkling of the blood of an animal sacrifice. Also, the wording of a vow to bring a grain-offering will have significant impact on what the obligation becomes. With examples of how a vow can go unfulfilled when the oath and the offering do not match.