And then we're going to have the ones that do involve the natural log. Natural log of four minus the natural log of two. So we could write this plus the natural log of four minus the natural log of two. And you might remember from your logarithm properties that this over here, this is the same thing as the natural log of four divided by two. This comes straight out of your logarithm properties. And so this is going to be the natural log of two. Natural log of two.