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