ent">// Tag for the name of the person</span>

<span class="keyword">typedef</span> <span class="identifier">bimap</span>
<span class="special">&lt;</span>
                 <span class="identifier">tagged</span><span class="special">&lt;</span> <span class="keyword">int</span>        <span class="special">,</span> <span class="identifier">id</span>   <span class="special">&gt;</span>  <span class="special">,</span>
    <span class="identifier">multiset_of</span><span class="special">&lt;</span> <span class=