[1,2,3,4,1,2,5,3,6,4,1,2,7,5,3,8,6,4,1,2,9,7,5,3, 10,8,6,4,1,2,11,9,7,5,3,12,10,8,6,4,1,2,13,11,9,7, 5,3,14,12,10,8,6,4,1,2,15,13,11,9,7,5,3,16,14,12, 10,8,6,4,1,2,17,15,13,11,9,7,5,3,18,16,14,12,10,8, 6,4]