@Override
    public void remove() {
      checkForConcurrentModification();
      CollectPreconditions.checkRemove(toRemove != -1);
      size -= backingMap.removeEntry(toRemove);
      entryIndex = backingMap.nextIndexAfterRemove(entryIndex, toRemove);
      toRemove = -1;
      expectedModCount = backingMap.modCount;
    }
  }

  @Override
  final Iterator<E> elementIterator() {
    return new Itr<E>() {

    return table.length - 1;
  }

  int firstIndex() {
    return (size == 0) ? -1 : 0;
  }

  int nextIndex(int index) {
    return (index + 1 < size) ? index + 1 : -1;
  }

  int nextIndexAfterRemove(int oldNextIndex, @SuppressWarnings("unused") int removedIndex) {
    return oldNextIndex - 1;
  }

  int size() {
    return size;
  }

  @SuppressWarnings("unchecked")
  @ParametricNullness