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Annual rings are concentric circles or layers of wood that are formed in the trunk of a tree as a result of its annual growth. Each ring represents one year of growth. The formation of annual rings is particularly evident in temperate and boreal regions, where there are distinct seasons.
5, 11, 32, 65, ?, 389
65    69   77 93  ?    189
13Â Â Â Â Â Â Â Â Â Â 182Â Â Â Â Â Â Â Â 303Â Â Â Â Â Â Â Â 384Â Â Â Â Â Â Â Â 433Â Â Â Â Â Â Â Â ?
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21: 3 ∷ 574: ?
0Â Â Â Â Â Â 2 Â Â Â Â Â Â Â 6Â Â Â Â Â Â 12 Â Â Â Â Â Â 20Â Â Â Â Â Â Â ?
...18 113 559 2247 6721 13451
...3 15 35 63 99 ?
12, 16, 25, 41, 66, ?
4 12 ? 144 544 2112
...17Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 26Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 37Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â...