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Language/Type: C# recursion

Given the method below, what is the output of the following call? (What is the method really doing?)

public static int Mystery(int n)
    if (n < 10)
        return (10 * n) + n;
        int a = Mystery(n / 10);
        int b = Mystery(n % 10);
        return (100 * a) + b;
(order shuffled)

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