! pipedum_20.scl ! 9801/9800, 243/242, 126/125, 100/99, Paul Erlich, 2000 20 ! 28/27 15/14 10/9 140/121 33/28 11/9 14/11 33/25 15/11 140/99 22/15 50/33 11/7 18/11 5/3 121/70 9/5 28/15 27/14 2/1