But if we just think about it generally, how many different spots, how many of different flips can that first head show up in? Well, there's 4 different flips that that first head could show up in. So there's 4 possibilities, 4 flips, or 4 places that it could show up in. Well, if that first head takes up one of these 4 places, let's just say that first head shows up on the third flip, then how many different places can that second head show up in? Well, if that first head is in one of the 4 places, then that second head can only be in 3 different places. So that second head can only be in 3 different places. And so it could be in any one of these.