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<?php
$single = (is_single() ? TRUE : FALSE);
if ($single){
$prevPost = get_previous_post();
if (!empty( $prevPost )){ ?>
<link rel="prev" href="<?php echo get_permalink($prevPost->ID); ?>"/>
<?php }
$nextPost = get_next_post();
if (!empty( $nextPost )) { ?>
<link rel="next" href="<?php echo get_permalink($nextPost->ID); ?>"/>
<?php }
}
?>
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