1:12:1,23:1,34:1,2,45:1,5,6:1,2,3,67:1,78:1,2,4,89:1,3,910:1,2,5,1011:1,1112:1,2,3,4,6,1213:1,1314:1,2,7,1415:1,3,5,1516:1,2,4,8,1617:1,1718:1,2,3,6,9,1819:1,1920:1,2,4,5,10,20