And the way we're conceptualizing things right here, this is the number 3. This isn't like somebody's score on a test or the number of apples they have. So there you could have multiple people with the same number of apples. Here we're talking about the object, the number 3. So we can only have a 3 once. But a 3 is in set is in x or y. So I'll put a 3 there.