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<nav>
  <ul>
    <li><a href="{{site.baseurl}}/" class="{% if page.url == '/index.html' %}current{% endif %}">Home</a></li>
    <li><a href="{{site.baseurl}}/planets">Planets</a></li>
    <li><a href="{{site.baseurl}}/news.html" class="{% if page.url == '/news.html' %}current{% endif %}">News</a></li>
  </ul>
</nav>