A <a href="https://en.wikipedia.org/wiki/Median_graph" class="extiw" title="en:Median graph">median graph</a> representing the set of solutions to a <a href="https://en.wikipedia.org/wiki/2-satisfiability" class="extiw" title="en:2-satisfiability">2-satisfiability</a> instance
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
<span class="int-own-work" lang="en">Own work</span>