[0,2,4,1,3,5,7,9,6,8,10,12,14,11,13,15,17,19,16,
18,20,22,24,21,23,25,27,29,26,28,30,32,34,31,33,
35,37,39,36,38,40,42,44,41,43,45,47,49,46,48,50,
52,54,51,53,55,57,59,56,58,60,62,64,61,63,65,67,
69,66,68,70,72,74,71,73,75,77,79,76,78,80,82,84,
81,83,85,87,89,86,88,90]
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