Now the number 12, that's in set x, but it isn't at y. So we're not going to include that. The number 5, it's in x, but it's not in y. And then we have the number 13 is in x, but it's not in y. And so over here, the intersection of x and y is the set that only has one object in it. It only has the number 3. So we are done.