using System;

public class Program

{

    interface IDummyParent

    {

        void Open();

    }

    interface IDummyHides : IDummyParent

    {

        void Open();

    }

    interface IDummy1

    {

        void Open();

    }

​

    interface IDummy2

    {

        void Open();

    }

​

    class Dummy : IDummy1, IDummy2, IDummyHides

    {

​

        void IDummyHides.Open()

        {

            Console.WriteLine("Hides");

        }

        void IDummyParent.Open()

        {

            Console.WriteLine("Parent");

        }

        void IDummy1.Open()

        {

            Console.WriteLine("1");

        }

​

        public void Open()

        {

            Console.WriteLine("2");

        }

    }

    public static void Main()

    {

        new Dummy().Open();

        ((IDummy1) new Dummy()).Open();

        ((IDummy2) new Dummy()).Open();

        ((IDummyHides) new Dummy()).Open();

        ((IDummyParent) new Dummy()).Open();

        Console.WriteLine("Hello World");

    }

}