span><span class="o">(</span><span class="n">arg</span><span class="o">).</span><span class="na">append</span><span class="o">(</span><span class="s">"_"</span><span class="o">);</span>
            <span class="k">if</span> <span class="o">(!</span><span class="n">isLastElement</span><span class="o">)</span> <span class="n">buf</span><span class="o">.</span><span class="na">append</span><span class="o">(</span><span class="s">", "</span><span class="o">);</span>
        <span class="o">}</span>
        <spa