an class="special">::</span><span class="identifier">copy</span></code>
          from containers <code class="computeroutput"><span class="identifier">like</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span></code>,
          or use <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">make_pair</span></code> to add new elements. However
          it is best to use <code class="compute