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The Fibonacci sequence is given by $F_1 = 1$, $F_2 = 1$ and $F_{n+1} = F_n + F_{n-1}$. What is

$\sum_{n=2}^\infty \frac{ 1 } { F_{n-1} F_{n+1} } ?$

Give your answer to 2 decimal places.

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