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          Unordered Collections


     An unordered collection is a  class  derived  from  Collection in
     which  the  ordering  of  the  objects  in  the   class   is  not
     discernible.  Since the unordered collection class requires  only
     that  an  object  can be tested for membership in the collection,
     objects of any class derived  from the abstract base class Object
     can be put into an unordered collection.