And so when we're talking about x intersect y, we're talking about where the two sets overlap. So we're talking about this region right over here. And the only place that they overlap the way I've drawn it is at the number 3. So this is x intersect y. And then x union y is the combination of these two sets. So x union y is literally everything right here that we are combining. Let's do one more example just so that we make sure we understand intersection and union.