public void printList(Node node)
	{
		if(node == null) 
		{
			System.out.println("\nItems: " + items);
			return;
		}
		if(node.prev != null) 
			System.out.print(node.prev.frequency + ":");
		System.out.print(node.frequency + " -> ");
		printList(node.next);
	}