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%person = (
             firstname => ['name1', 'name2', 'name3'],
             lastname => ['lname1', 'lname2', 'lname3'],
             city => ['city1','city2','city3']
          );

$person = {
             firstname => ['name1', 'name2', 'name3'],
             lastname => ['lname1', 'lname2', 'lname3'],
             city => ['city1','city2','city3']
          };

%person = (
             firstname => ['name2', 'name1', 'name3'],
...
           $person{lastname}[$_],
           $person{city}[$_]);
}