code: public boolean remove()
      {
          if (_last1.key() == null)
              throw new java.util.NoSuchElementException(
                                                        "remove() without calling next()");
  
          boolean result = internalRemove();
  
          return result;
      }
docs: Remove from the collection the last thing returned by next().
  
  @exception NoSuchElementException if next() has never been called.
  
  @return true if the element was there to be removed.