[2,1,4,6,3,8,5,10,12,7,14,16,9,18,11,20,22,13,24, 15,26,28,17,30,32,19,34,21,36,38,23,40,42,25,44, 27,46,48,29,50,31,52,54,33,56,58,35,60,37,62,64, 39,66,41,68,70,43,72,74,45,76,47,78,80,49,82,84, 51,86,53,88,90]