In combinatorics, Fibonacci numbers are a sequence of numbers defined by the recurrence relation F(n) = F(n-1) + F(n-2) and the initial values F(0)=1 and F(1)=1. The Fibonacci numbers are supposed to give the number of pairs of rabbits in an enclosure n months after a breeding pair is placed in it, if newly born pairs of rabbits begin breeding themselves in their second month.

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