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18,21,17,20,16,19,15,18

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โˆ™ 2013-05-16 07:13:28
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โˆ™ 2020-05-01 13:41:13

14. the way you get it is to add three, subtract for, and keep repeating that until the end.

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Q: What number should come next in the following sequence 18211720161915?
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