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package cap3
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func Ex40(n int) int {
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var fab func(n int) int
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fab = func(n int) int {
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if n == 1 {
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return 1
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}
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if n == 2 {
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return 2
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}
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return fab(n-1) + fab(n-2)
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}
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return fab(n)
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}
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