[0,1,2,3,4,5,2,3,4,5,6,7,4,5,6,7,8,9,6,7,8,9,10, 11,8,9,10,11,12,13,10,11,12,13,14,15,4,5,6,7,8,9, 6,7,8,9,10,11,8,9,10,11,12,13,10,11,12,13,14,15, 12,13,14,15,16,17,14,15,16,17,18,19,8,9,10,11,12, 13,10]