="articles/pdqr-01-create.html">Create pdqr-functions with `new_*()`</a>
    </li>
    <li>
      <a href="articles/pdqr-02-convert.html">Convert pdqr-functions with `as_*()`</a>
    </li>
    <li>
      <a href="articles/pdqr-03-transform.html">Transform pdqr-functions with `form_*()` and base operations</a>
    </li>
    <li>
      <a href="articles/pdqr-04-summarize.html">Summarize pdqr-functions with `summ_*()`</a>
    </li>
  </ul>
</li>
<li>
  <a href="news/index.html">Changelog</a>
</li>
      </ul>
