  <ul class="dropdown-menu" aria-labelledby="dropdown-articles"><li><a class="dropdown-item" href="../articles/intro.html">Introduction</a></li>
    <li><a class="dropdown-item" href="../articles/classic.html">Classic Algorithm</a></li>
    <li><a class="dropdown-item" href="../articles/performance.html">Statistical Performance</a></li>
  </ul></li>
<li class="nav-item"><a class="nav-link" href="../news/index.html">Changelog</a></li>
      </ul><ul class="navbar-nav"><li class="nav-item"><a class="external-