[0,1,2,3,4,5,2,3,4,5,6,7,4,5,6,7,8,5,6,7,8,9,6,7, 8,9,10,7,8,9,10,11,12,9,10,11,12,13,10,11,12,13, 14,11,12,13,14,15,12,13,14,15,16,17,14,15,16,17, 18,15,16]