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use warnings;
use strict;
...
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed
tristique purus urna, a lacinia nulla euismod et. Pellentesque tempus
et justo faucibus. <i>Fusce scelerisque, <b>magna</b> <a href="http://
+www.example.com">efficitur congue, leo ...</a></i></p>

            elsif ( $n->type eq 'tag' && $filter{$n->tag} )
                { $walk->($n, $out) }