public class ListApp
{
    public static void main(String[] args)
    {
         List commonwealths = List.EMPTY;
         
         commonwealths = new List("Kentucky",commonwealths);
         commonwealths = new List("Massachusetts",commonwealths);
         commonwealths = new List("Pennsylvania",commonwealths);
         commonwealths = new List("Virginia",commonwealths);
         System.out.println(commonwealths);
    }
}
/*
Virginia Pennsylvania Massachusetts Kentucky
*/