els-and-Trees/ex9-4/" class="md-nav__link">
        Ex. 9.4
      </a>
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      <a href="../../9-Additive-Models-and-Trees/ex9-5/" class="md-nav__link">
        Ex. 9.5
      </a>
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    <li class="md-nav__item">
      <a href="../../9-Additive-Models-and-Trees/ex9-6/" class="md-nav__link">
        Ex. 9.6
      </a>
    </li>
  

     