So let's think about what this is. So the number 3 is in set A and it's in the set of all things in the universe that are neither a 0 or blue. So let's throw a 3 in there. The number 7, it's an A and it's in the set of all things in the universe that are neither a 0 or a blue. So let's put a 7 there. Negative 5 also meets that constraint. A 0 does not meet that constraint.