on-statements" class="nav-link" data-scroll-target="#defining-probability-functions-for-distribution-statements">Defining probability functions for distribution statements</a></li>
  </ul></li>
  <li><a href="#parameters-are-constant" id="toc-parameters-are-constant" class="nav-link" data-scroll-target="#parameters-are-constant">Parameters are constant</a></li>
  <li><a href="#return-value" id="toc-return-value" class="nav-link" data-scroll-target="#return-value">Return value</a>
  <ul class="collapse">
  <