[1,0,2,0,3,4,0,0,5,6,0,0,6,7,9,0,0,0,8,10,11,0,0, 0,0,11,12,14,0,0,0,0,14,13,15,16,0,0,0,0,0,15,16, 17,19,0,0,0,0,0,0,19,18,20,23,0,0,0,0,0,0,0,20,21, 24,25,0,0,0,0,0,0,0,0,22,25,26,28,0,0,0,0,0,0,0,0, 0,28,27,29,30]