! pipedum_17c.scl ! 1605632/1594323, 177147/175616, Manuel Op de Coul, 2002 17 ! 6561/6272 7168/6561 8/7 32/27 896/729 9/7 4/3 2187/1568 81/56 3/2 128/81 3584/2187 12/7 16/9 729/392 27/14 2/1