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