So there's 12 different scenarios if you couldn't swap them, but you want to divide it by all of the different ways that you can swap 2 things. So 12 divided by 2 is equal to 6 fundamentally different scenarios, considering that you can swap them. If you assume that head A and head B can be interchangeable, that it's a completely identical outcome for us, because they're really just heads. So there's 6 different scenarios, and we know that there's a total of 16 equally likely scenarios. So we could say that the probability of getting exactly 2 heads is 6 times 6 scenarios. And there's a couple of ways. You could say there's 6 scenarios that give us 2 heads of a possible 16, or you could say there are 6 possible scenarios, and the probability of each of those scenarios is 1 16th.