private Node<AnyType> getNode(int index, int lower, int upper)
  {
    // Write code here to implement this method.
      if (index < 0) throw new IllegalArgumentException("Index can not be less than 0");
      else
      {
          if ((index >= lower) && (index <= upper))
          {
              for (int i = lower; i <= index; i++)
              {
                  if (LLI.hasNext())
                      LLI.next();
              }
          }
          return LLI.current;
      }
  }