! pipedum_21b.scl ! 36/35, 225/224, 1029/1024, Gene Ward Smith, 2002 21 ! 49/48 16/15 49/45 8/7 7/6 128/105 56/45 21/16 4/3 7/5 64/45 3/2 32/21 8/5 49/30 12/7 7/4 64/35 28/15 256/135 2/1