This is all a review, this is covered in the permutations video, but it'll be very instructive as we move into a new concept. So what are all of the permutations of putting six different people into three chairs? Well, like we've seen before, we could start with the first chair, and we could say, look, if we haven't seated anyone yet, how many different people could we put in chair number one? Well, there's six different people who could be in chair number one. Let me do that in a different color. There are six people who could be in chair number one. Six different scenarios for who sits in chair number one.