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    <h2 id="toc-title">Table of contents</h2>
   
  <ul>
  <li><a href="#what-is-csp" id="toc-what-is-csp" class="nav-link active" data-scroll-target="#what-is-csp">What is ‘CSP’?</a></li>
  <li><a href="#descriptions-of-variables" id="toc-descriptions-of-variables" class="nav-link" data-scroll-target="#descriptions-of-variables">Descriptions 