This program illustrates reverse iterators for sets, as well as
the member functions rbegin() and rend().
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First we create an array of five characters, then a set
of the same five characters from that array.
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Now we use a reverse iterator to display the set contents
in descending key order.
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E D C B A
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Finally, we use a reverse iterator to display the set contents
in ascending key order.
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A B C D E
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