! pentatetra1.scl ! Penta-tetrachord 20/19 x 19/18 x 18/17 x 17/16 = 5/4. 5/4 x 16/15 = 4/3 9 ! 20/19 10/9 5/4 4/3 3/2 30/19 5/3 15/8 2/1