<a href="https://en.wikipedia.org/wiki/Kissing_number" class="extiw" title="w:Kissing number">Kissing number</a> in two dimensions is 6
<a href="//commons.wikimedia.org/wiki/User:N.Mori" title="User:N.Mori">N.Mori</a>
2007-02-27
<a href="https://en.wikipedia.org/wiki/Image:Kissing-2d.jpg" class="extiw" title="w:Image:Kissing-2d.jpg">w:Image:Kissing-2d.jpg</a>