This dotted line, we could just draw it like this. And so this would be the point x equals two. And then the graph of y is equal to four times the natural log of three minus x would look something like this. Look something like this. And so this region is this region. But it's going to be the base of a three-dimensional shape where any cross-section, if I were to take a cross-section right over here, is going to be a square. So whatever this length is, we also go that much high.