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        Create a reverse hash: 
    
    ...
        If your hash could have repeated values, the methods
        above will only find one of the associated keys.
        This may or may not worry you.
    
  2. or download this
        package SpecialHash;
        use Tie::Hash;
    ...
    
        use Data::Dumper;
        print Dumper $hash{FLIPPED};