flying junction, straight and from the upper left
<a href="//commons.wikimedia.org/wiki/User:Axpde" title="User:Axpde">axpde</a> and <a href="//commons.wikimedia.org/wiki/User:Mahir256" title="User:Mahir256">Mahir256</a>
2013-12-25
Own work based on: <a href="//commons.wikimedia.org/wiki/File:BSicon_ABZg%2B1u.svg" title="File:BSicon ABZg+1u.svg">BSicon ABZg+1u.svg</a>