="off" autocorrect="off" autocapitalize="off" spellcheck="false" placeholder="Search...">
      <input type="submit" value="Go">
    </form>
  </div>
</div>
<script>document.getElementById('searchbox').style.display = "block"</script>

    <nav class="toc-link">
      <a href="contents.html" >Table of contents</a>
    </nav>

    <nav class="table-of-contents">
      <ul class="current">
<li class="toctree-l1 current"><a class="current reference internal" href="#">Introduction</a></li>
<li class="toctree-l1