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- LLStackIter<T> and AStackIter<T> are used to create iterator
- classes. A template class created from LLStackIter<T> is a
- friend of template classes created from LLStack<T>. The
- friend relationship also holds between AStackIter<T> and
- AStack<T>. Because the iterator classes are friends of the
- stack classes, they are allowed access to the private members
- of the stack classes.
-