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      <a href="../../_12-Flexible-Discriminants/ex12-05/" class="md-nav__link">
        Ex. 12.5 (TODO)
      </a>
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    <li class="md-nav__item">
      <a href="../../_12-Flexible-Discriminants/ex12-06/" class="md-nav__link">
        Ex. 12.6
      </a>
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    <li class="md-nav__item">
      <a href="../../_12-Flexible-Discriminants/ex12-07/" class="md