 <a href="../../_11-Neural-Networks/ex11-1/" class="md-nav__link">
        Ex. 11.1
      </a>
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      <a href="../../_11-Neural-Networks/ex11-2/" class="md-nav__link">
        Ex. 11.2
      </a>
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    <li class="md-nav__item">
      <a href="../../_11-Neural-Networks/ex11-3/" class="md-nav__link">
        Ex. 11.3
      </a>
    </l