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use constant { NAME=>0, TYPE=>1, DETAILS=>2 };

...
    }
}
close OUT;

        ## while TYPE is undefined, but  DETAILS are
        ## and there is another line in this page
...
         and     $meta[ $page ][ $line +1 ][ DETAILS ]
         and     $line +1 < @{ $meta[ $page ] }
        ) {

        ## while there is another line in this page
        ## and its TYPE is undefined, but its DETAILS are
...
         and ! $meta[ $page ][ $line +1 ][ TYPE ]
         and   $meta[ $page ][ $line +1 ][ DETAILS ]
        ) {