static void Main(string[] args)
        {
			MyClass mc = new MyClass();
			foreach (var item in mc) // Use the instance of MyClass.
			{
				Console.WriteLine(item);
			}
		}
        static void Main(string[] args)
        {
			MyClass mc = new MyClass();
			// Calling the iterator method directly.
			foreach (string item in mc.WriteAndBlack())
			{
				Console.WriteLine(item);
			}
		}
        static void Main(string[] args)
        {
			MyClass mc = new MyClass();
			// Use the class object.
			foreach (string shade in mc)
			{
				Console.Write(shade + "\t");
			}
			
			// Use the class iterator method.
			foreach (string shade in mc.WriteAndBlack())
			{
				Console.Write(shade + "\t");
			}
		}