Well, you take the square root, and then you take the natural log of that. And so then you take the natural log of that. So you could view that as inputting it into another function that takes the natural log of whatever is inputted in. I'm making these little squares to show what you do with the input. And then what do you produce? Well, you produce the natural log of the square root of x. Natural log of the square root of x, which is equal to f of x.