We're going to take out a 7. We're going to take out a negative 5. And we're going to take out a 13. So we're just left with the set that contains a 0. So all of this business right over here has simplified to a set that only contains 0. Now let's think about what B intersect C is. These are all of the things that are in both B and C. So this is going to be B intersect C. Let's see.