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using System;
 
class HelloWorld
{
    static void Main()
    {
        int[] _array_ = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,13,14,42,42,};
 
        string _buffer_ = "";
        for (int i = 0; i < _array_.Length; ++i)
        {
            for (int j = 0; j < _array_.Length; ++j)
            {
                if (j == i)
                    continue;
                if (_array_[j] == _array_[i])
                {
                    _buffer_ += Convert.ToString(_array_[i]) + " ";
                }
            }
        }
        Console.WriteLine($"Повторяющиеся элементы массива '_array_':\n{_buffer_}");
        string a = Convert.ToString(_array_[1..4]);
        Console.WriteLine(a);
    }
}