Cycle graph V4 Klein four-group
<a href="//commons.wikimedia.org/w/index.php?title=User:Ivan_Ignatov&amp;action=edit&amp;redlink=1" class="new" title="User:Ivan Ignatov (page does not exist)">Ivan Ignatov</a>
<span class="int-own-work" lang="en">Own work</span>