* 3/3, 2; 3/4, 2; 3/5, 2; 3/6, 2;
* 4/6, 2; 4/7, 2; 4/8, 2;
* 5/8, 3; 6/8, 3; 7/8, 3; 8/8, 3;
* 7/8, 3; 6/7, 3; 5/6, 3; 4/5, 2;
  4/4, 2; 2/3, 2.