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The rule is additive. The first pair of numbers in the series is added to create the next, thus: 4 + 9 = 13. Subsequently the new number generated (13) is added to the one preceding it (9) therefore 9 + 13 = 22. This continues, adding the new to the one immediately prior to is in this manner: 13 + 22 = 35, 22 + 35 = 57, 35 + 57 = 92 and so on.

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Q: What is the rule of the pattern 4-9-13-22-35?
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