public class Dog{

            string name;
       }

       public class Duck{

           string name;
       }

       public class Cow{

           string name;
       }




        public static void Main(string[] args)
        {

            List<Animal> animals = new List<Animal>(){
                new Dog("Dogy"),
                new Duck("Ducky"),
                new Cow("Cowy")
            }


            foreach(Animal a on animals)
            {
                 MakeSound(a, rule);
            }

        }