And the reason why that's useful is we're only dealing with 4 flips now. But if we were dealing with 10 flips, there's no way that we could write out all the possibilities like this. So I really want a different way of thinking about it. And the different way of thinking about it is if we're saying exactly 2 heads, you can imagine we're having the 4 flips. Flip 1, flip 2, flip 3, flip 4. So these are the flips, or you could say the outcome of the flips. And if you're going to have exactly 2 heads, you could say, well, look, I'm going to have 1 head in one of these positions and then 1 head in the other position.