[2,1,2,5,4,7,6,9,10,11,10,13,12,15,16,17,16,19,18,
 21,22,23,22,25,26,27,28,29,28,31,30,33,34,35,36,
 37,36,39,40,41,40,43,42,45,46,47,46,49,50,51,52,
 53,52,55,56,57,58,59,58,61,60,63,64,65,66,67,66,
 69,70,71,70,73]