public static void Main()
{
RemoveDuplicate <int> sList = new RemoveDuplicate <int>();
sList.addNode(1);
sList.addNode(2);
sList.addNode(3);
sList.addNode(2);
sList.addNode(2);
sList.addNode(4);
sList.addNode(1);
Console.WriteLine("Originals list: ");
sList.display();
sList.removeDuplicate();
Console.WriteLine("List after removing duplicates: ");
sList.display();
}