So here you would care about order. And so, one way to think about it, this two is correcting for this double counting here. And if you wanted to apply the formula, you could. I just kind of reasoned through it again. I mean, you could literally say, okay, four times three is 12, we're double counting, because there's two ways to arrange two people, so you just divided it by two. So you just divide by two. And then you are going to be left with six.