So you have n minus 1 degrees of freedom for each of these groups, so it's n minus 1, n minus 1, n minus 1. Or you have, let me put it this way, you have n minus 1 for each of these groups. And there are m groups. So there's m times n minus 1 degrees of freedom. And in this case, in particular, each group, n minus 1 is 2, or in each case, you had 2 degrees of freedom. And there's 3 groups of that, so there are 6 degrees of freedom. There are 6 degrees of freedom.