>,</span> <span class="identifier">N</span> <span class="special">&gt;</span><span class="special">,</span> <span class="identifier">Ns</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>
      <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">,</span> <span class="keyword">typename</span> S<span class="special">,</span> <span class="keyword">typename</span> Iterable<span class="sp