special">&lt;</span><span class="keyword">typename</span> Iterable<span class="special">,</span> 
             <span class="keyword">typename</span>  <span class="special">=</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">requires_sequence_of_any_axis</span><span class="special">&lt;</span><span class="identifier">Iterable</span><span class="special">&gt;</span> <span class="special">&gt;</span> 
      <span class="keyword">auto</span> <a class="link" hre