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my $cats_sth = $dbh->prepare(<<"EndOfSQL");
  SELECT category_id, name, parent
  FROM   $sql{categories}
...
        print_category($cats->[$child_id], $cats, "$indent  ");
    }
}

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[
   [ name, parent id, [ child ids ] ],
   [ name, parent id, [ child ids ] ],
   ...
]