pecial">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="identifier">expand</span><span class="special">(</span><span class="identifier">all</span><span class="special">,</span> <span class="identifier">make</span><span class="special">&lt;</span><span class="identifier">box</span><span class="special">&gt;(</span><span class="number">0</span><span class="special">,</span> <span class="number