using System;

public class Program

{

    public static void Main()

    {

        IRobot r = new Robot();

​

        r.SaySomething();

    }

}

​

​

public class Machine

{

    public void SaySomething()

    {

        Console.WriteLine("This is");

    }

}

​

public interface IRobot

{

    void SaySomething();

}

​

​

public class Robot : Machine, IRobot

{

}

​

​

​