[4,1,5,2,-1,3,0,4,1,5,2,6,3,0,4,1,5,2,6,3,7,4,1,5, 2,6,3,7,4,8,5,2,6,3,7,4,8,5,9,6,3,7,4,8,5,9,6,10, 7,4,8,5,9,6,10,7,11,8,5,9,6,10,7,11,8,12,9,6,10,7, 11,8,12,9,13,10,7,11,8,12,9,13,10,14,11,8,12,9,13, 10,14,11]