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