Well, you know, factorial is kind of a neat little operation. How can I relate factorial to what we did just now? Well, it looks like we kind of did factorial, but then we stopped. We stopped at, we didn't go times two times one. So one way to think about what we just did is we just did five times four times three times two times one. But of course, we actually didn't do the two times one. So you could take that and you could divide by two times one.