This would count as two different codes right here, even though we've picked the same actual colors, the same four colors. We've picked them in different orders. With that out of the way, let's think about how many different ways we can pick four colors. Let's say we have four slots here. One slot, two slot, three slot, and four slots. At first, we care only about how many ways can we pick a color for that slot right there, that first slot. We haven't picked any colors yet.