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