/span><span class="identifier">rng1</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">distance</span><span class="special">(</span><span class="identifier">rng2</span><span class="special">)</span></code>.
          </p>
<p>
            The two versions of <code class="computeroutput"><span class="identifier">merge</span></code>
            differ by how they compare the elements.
          </p>
<p>
            The non-predicate version uses the <code class="comput