[0,1,2,2,3,3,4,4,5,5,6,6,7,7,8,7,8,9,10,9,11,10, 11,10,12,11,11,13,14,12,13,12,14,13,15,13,14,14, 15,14,15,16,17,16,17,17,18,18,19,19,20,20,21,20, 22,21,23,22,23,22,23,23,23,23,24,24,25,25,26,26]