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How to show the related posts list?

Add this code (in your index.php or somewhere else):

<?php if (ls_getinfo('isref')) : ?>
   <h2><?php ls_getinfo('terms'); ?></h2>
   <p>You came here from <?php ls_getinfo('referrer'); ?> searching for <i><?php ls_getinfo('terms'); ?></i>. These posts might be of interest:</p>
   <ul>
     <?php ls_related(5, 10, '<li>', '</li>', '', '', false, false); ?>
   </ul>
<?php endif; ?>

How this plugins was made?

With help from these scripts: http://textsnippets.com/posts/show/231