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%Persons_by_surname = ( 'Schwartz' => [ { ..person 1 },
                                        { ..person 2},
                                      ],

                        'Wall' => [ {..person 1..} ] );

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my %data= ( 'surname' => \%Persons_by_surname,
            'firstname' => \%Persons_by_firstname,
            # ... and so on
          );