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    // recursive implementation
    public static int gcd(int p, int q) {
        if (q == 0) return p;
        else return gcd(q, p % q);
    }

    // non-recursive implementation
    public static int gcd2(int p, int q) {
        while (q != 0) {
            int temp = q;
            q = p % q;
            p = temp;
        }
        return p;
    }