[lemma=a] [lemma=link] [!□] □ □
[lemma=a] [lemma=link] [!□=□] □ □
[lemma=a] [lemma=link] [!(□ | □)] □ □
They're abbreviating their URLs , using the mod_rewrite Apache module , so that a link like " / N " redirects to " mysite.com/content/unregistered/News " .