The function, if you said what is f of four, it's not defined. But it looks like when we approach it from the left, when we approach x equals four from the left, it looks like f is approaching three. And when we approach four from the right, once again, it looks like our function is approaching three. So here, I would say, at least from what we can tell from the graph, it looks like the limit of f of x as x approaches four is three, even though the function itself is not defined there. Now let's think about the limit as x approaches two. So this is interesting. The function is defined there.