[1,2,3,4,8,9,7,10,6,11,5,12,16,17,15,18,14,19,13, 20,29,30,28,31,27,32,26,33,25,34,24,35,23,36,22, 37,21,38,47,48,46,49,45,50,44,51,43,52,42,53,41, 54,40,55,39,56,72,73,71,74,70,75,69,76,68,77,67, 78,66,79,65,80]