! cw19_7.scl ! CalkinWilf(<19 30 44 53|) 19 ! 21/20 35/32 9/8 7/6 6/5 5/4 9/7 4/3 7/5 10/7 3/2 14/9 8/5 5/3 7/4 9/5 15/8 40/21 2/1