Number reasoning: 1,1,2,3,8,7 () () 35,21

1,1,2,3,8,7 (19) (13) 35,21
The odd term is 1 28 19 35
Their difference is 16 11 16
The second level difference is 5
Even items are 1 3 7 13 21
The difference is 2468
The second level difference is 2

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