using System;

public class Program

{

    public static void Main()

    {

        Car car = new Car();

        car.Start();

    }

}

​

public class Car

{

    private Engine engine;

    public Car()

    {

        engine = new Engine();      

    }

    public void Start()

    {

        engine.Start();     

        Console.WriteLine("El auto se encendió.");

    }

}

​

public class Engine

{

    private Piston piston;

    public Engine()

    {

        piston = new Piston();

    }

    public void Start()

    {

        piston.Start();     

        Console.WriteLine("El motor comenzó a funcionar.");

    }   

}

​

public class Piston

{

    public void Start()

    {

        Console.WriteLine("El piston comenzó a moverse.");

    }

}