So let me just write it all out, actually. I think that might be an easier thing to do. Because I want to find, for all of these guys combined, the sum of squares due to the differences between the samples. So that's from the first sample, the contribution from the first sample. And then from the second sample, you have this guy over here, 5, oh sorry, you don't want to calculate him. For this data point, the amount of variation due to the difference between the means is going to be 4 minus 4. It's going to be 4 minus 4 squared.