9,8,6,7,12,11,10,5,4,25,26,0,2,3,1,48,49,19,20,21,16,31,32,33,34,35,37,36,40,39,38,13,44,45,47,46,22,23,24,15,14,43,30,28,29,27,17,18,41,42