omputeroutput"><span class="identifier">rng1</span></code>
            and <code class="computeroutput"><span class="identifier">rng2</span></code> are empty, otherwise
            at most <code class="computeroutput"><span class="identifier">distance</span><span class="special">(</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