/emu-const>, then<ol><li>If <var>k</var> is <emu-val>true</emu-val>, let <var>R</var> be the string-concatenation of <var>R</var> and <var>sep</var>.</li><li>Set <var>k</var> to <emu-val>true</emu-val>.</li><li>Let <var>next</var> be ?&nbsp;ToString(<var>e</var>).</li><li>Set <var>R</var> to the string-concatenation of <var>R</var> and <var>next</var>.</li></ol></li></ol></li><li>Return <var>R</var>.</li></ol></emu-alg></emu-import>
        </emu-clause>

        <emu-clause id="Set.prototype.add-elements">