using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            WoodDuck qua = new WoodDuck();
            qua.DuckFly();
 
        }
    }
    interface FlyBehavior {
        void fly();
    }
 
    class FlyWithWings:FlyBehavior {
        public void fly() {
            Console.WriteLine("I can fly with wings!");
        }
    }
    class FlyWithRockets:FlyBehavior {
        public void fly() {
            Console.WriteLine("Fly! With Rockets!");
        }
    }
 
    class duck {
    }
 
    class WoodDuck : duck {
        FlyBehavior WFB;
        public WoodDuck() {
            WFB = new FlyWithWings();
        }
        public void DuckFly(){
            WFB.fly();
        }
    }
}
 

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