! pipedum_18.scl ! 875/864, 686/675, 128/125, Paul Erlich, 2001 18 ! 25/24 15/14 245/216 7/6 175/144 5/4 125/96 75/56 196/135 112/75 14/9 8/5 5/3 12/7 49/27 28/15 35/18 2/1