 OK, so what does this say? Determine what type and kind of radical process is taking place. So what are we doing here? We have a radical, and we're making a different radical. So what type of reaction is that? That's a propagation step. And then, of course, if we do the, just like Billy was saying, we can further categorize that as a particular type of propagation step, which is the hydrogen abstraction. So let's just draw the mechanism of the hydrogen abstraction just to emphasize what's going on. I want to draw more, but it's all written out there. So this is a type of propagation, like we said, hydrogen. So there are the four different types of propagation steps, so addition to a 5-on hydrogen abstraction, halogen abstraction, or elimination that they want you to do, that I want you to do. Any questions on this one? Again, how do I know it's a propagation? Because we've got one radical here, go to one radical. So this is stuff we talked about a week ago or so.