[0,1,1,0,2,2,0,3,3,0,4,4,0,5,5,0,6,6,0,7,7,0,8,8, 0,9,9,0,10,10,0,11,11,0,12,12,0,13,13,0,14,14,0, 15,15,0,16,16,0,17,17,0,18,18,0,19,19,0,20,20,0, 21,21,0,22,22,0,23,23,0,24,24,0,25,25,0,26,26,0, 27,27,0,28,28,0]