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let k = 2
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let n = 5
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let rec f (n, k) =
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        (1, 1) -> 1
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        |(0, _) -> 0
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        |(1, 1) -> 1
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        |(_, 0) -> 1
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        |(_, _) -> f(n - 1, k - 1) + f(n - 1, k)
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let rez = f (n, k)