DoublyLinkedListNode lCurrent = head;
		DoublyLinkedListNode rCurrent = head;

		while(rCurrent.next != null){
			rCurrent = rCurrent.next;
		}
			while(lCurrent != rCurrent && lCurrent.prev != rCurrent){
				int temp;
				temp = lCurrent.data;
				lCurrent.data = rCurrent.data;
				rCurrent.data = temp;
				lCurrent = lCurrent.next;
				rCurrent = rCurrent.prev;
      }
	}