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