<?php 
          $args = array(
          'before' => '<ul class="prev_next">',
          'after' => '</ul>',
          'next_or_number' => 'next',
          'nextpagelink' => '<li class="next"><strong>Continue reading</strong>Next Page</li>',
          'previouspagelink' => '<li class="prev"><strong>Go back</strong>Previous Page</li> '
          );
          wp_link_pages($args);
          ?>

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