return new RealizedElementCollectionIterator(getInserted(), NO_DUPLICATES);
    }

    @Override
    public Iterator<T> iteratorNoFlush() {
        return new RealizedElementCollectionIterator(getInserted(), NO_DUPLICATES);
    }

    @Override
    public boolean add(T element) {
        modCount++;
        if (nonProvidedValues.add(element)) {
            getInserted().add(new Element<T>(element));
            return true;

    }

    @Override
    public Iterator<T> iteratorNoFlush() {
        return listIterator();
    }

    @Override
    public ListIterator<T> listIterator() {
        return new RealizedElementListIterator(getInserted(), ALWAYS_ACCEPT);
    }

    @Override
    public ListIterator<T> listIterator(int index) {
        return Lists.newArrayList(listIterator()).listIterator(index);
    }

    @Override