nd <a class="link" href="algorithm/auxiliary/functions/copy.html" title="copy"><code class="computeroutput"><span class="identifier">copy</span></code></a> which are inherently imperative
        algorithms.
      </p></div>
<div id="ftn.fusion.algorithm.f1" class="footnote"><p><a href="#fusion.algorithm.f1" class="para"><sup class="para">[13] </sup></a>
        What does that mean? It means that when you operate on a sequence through
        a Fusion algorithm that returns a sequence, the sequence returned