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Recursionhard
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The Fibonacci sequence is defined by Fn=Fn−1+Fn−2F_n = F_{n-1} + F_{n-2}Fn​=Fn−1​+Fn−2​. Rearranging as Fn−2=Fn−Fn−1F_{n-2} = F_n - F_{n-1}Fn−2​=Fn​−Fn−1​ (backward recurrence), and given F5=5F_5 = 5F5​=5 and F4=3F_4 = 3F4​=3, find F2F_2F2​.