bold"><strong>one extra copy</strong></span></em></span> of the first argument
          <code class="computeroutput"><span class="identifier">object</span></code> that passes a container.
        </p></td></tr>
</table></div>
<p>
        Use infix operators only, if
      </p>
<div class="itemizedlist"><ul type="disc">
<li>
          efficiency is not crucial, e.g. the containers copied are small.
        </li>
<li>
          a concise and short notation is more important than efficiency in your
          