! pipedum_19f.scl ! 225/224, 245/243, 3645/3584, Paul Erlich, 2001 19 ! 36/35 16/15 192/175 7/6 135/112 5/4 9/7 4/3 48/35 35/24 3/2 14/9 8/5 224/135 12/7 175/96 15/8 35/18 2/1