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- The object "next" is an iterator for the List object "list".
- Every member function of the PhoneBk class declares its own
- iterator. Here, "next" is constructed and is initialized to the
- first item in the object "list". If "next" were a static member,
- a subsequent call of lookup could continue moving through the
- items in the list, starting where this call of lookup() leaves
- off.
-