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namespace Ducks

{

internal class Duck

{

private IQuackBehaviour _quacker;

private IFlyBehaviour _flyer;

public IQuackBehaviour Quacker {

set

{

_quacker = value;

}

}

public IFlyBehaviour Flyer

{

set

{

_flyer = value;

}

}

protected void PerformQuack()

{

_quacker.Quack();

}

protected void PerformFly()

{

_flyer.Fly();

}

}

internal class MallardDuck : Duck

{

public MallardDuck()

{

Flyer = new FlyNope();

Quacker = new QuackNope();

}

public void Display()

{

PerformFly();

PerformQuack();

}

}

internal static class Program

{

private static void Main()

{

var mallard = new MallardDuck {Quacker = new QuackNormal()};

mallard.Display();

mallard.Flyer = new FlyWings();

mallard.Display();

}

}

}