Continuation backward, shifted backward, set u
<a href="//commons.wikimedia.org/wiki/User:YLSS" title="User:YLSS">YLSS</a>, <a href="//commons.wikimedia.org/wiki/User:Sameboat" title="User:Sameboat">Sameboat</a>
2013-12-25
<span class="int-own-work" lang="en">Own work</span>