\(b_7 = 21 + 13 = 34\)

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• \(b_4 = 5 + 3 = 8\)
• \(b_5 = 8 + 5 = 13\)
• \(b_6 = 13 + 8 = 21\)
• \(b_8 = 34 + 21 = 55\)
• \(b_9 = 55 + 34 = 89\)
• So number of sequences with **at least one CC pair** is:

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