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sort sort_sub, keys(%a_hash);
# Sort allows you to use a subroutine to evaluate the keys.
# -- Assumes that the values in the hash are character strings; use '<
+=>' if they are not
An Englishman in New York
An American Werewolf in London
An American in Paris
The Innocents Abroad
An Idiot Abroad
Robinson Crusoe on Mars
A Connecticut_Yankee in King Arthur's Court
There and Back Again
Travels into Several Remote Nations of the World
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