[1,2,3,1,4,2,5,3,6,1,4,7,2,5,8,3,6,1,9,4,7,2,10,5, 8,3,11,6,1,9,4,12,7,2,10,5,13,8,3,11,6,14,1,9,4, 12,7,15,2,10,5,13,8,16,3,11,6,14,1,9,17,4,12,7,15, 2,10,18,5,13,8,16,3,11,19,6,14,1,9,17,4,12,20,7, 15,2,10,18,5,13]