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Add the increasing numbers by one -

as in 0 1 2 3 4 5 6 etc

1 + 0 = 1

1 + 1 = 2

2 + 2 = 4

4 + 3 = 7

7 + 4 = 11

11 + 5 = 16

16 + 6 = 22

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11y ago

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