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define fibonacci(n::integer) => {
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#n < 1 ? return false
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local(
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swap = 0,
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n1 = 0,
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n2 = 1
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)
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loop(#n) => {
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#swap = #n1 + #n2;
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#n2 = #n1;
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#n1 = #swap;
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}
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return #n1
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}
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fibonacci(0) //->output false
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fibonacci(1) //->output 1
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fibonacci(2) //->output 1
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fibonacci(3) //->output 2
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