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27, 26, 37, 37

There are two sequences mixed in together

2+7=9 9-4=5

5+8=13 13-3=10

10+9=19 19-2=17

This first set goes up by 1 each time.

The second set goes down by 1 each time.

17+10=27 27-1=26

26+11=37 37-0=37

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9y ago

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