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fibLoop := method(n,
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prev := 1;
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result := 0;
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while(n > 0,
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n = n - 1;
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temp := result
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result = prev + result
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prev = temp
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)
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result
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)
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fibLoop(30) println
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# time of fibLoop(30)
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# real 0m0.047s
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# user 0m0.041s
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# sys 0m0.004s
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