1 2 2 2 3 2 2 2 3 2 3 2 2 3 3 3 3 2 4 3 3 3 4 3 4 3 3 4 4 4 4 3 5 4 4 4 ... 1) never name more than three ranks at once 2) never name group sizes that differ by 2 3) 2 * n < n+1 < 3 * n 3') n+1 is less than n n n by epsilon 4) a single can only be named by itself