Comparison of the graphs of the Seven bridges of Konigsberg (top) and Five-room puzzle (bottom). The numbers denote the number of edges connected to each node. Nodes with an odd number of edges are shaded orange.
<a href="//commons.wikimedia.org/wiki/User:Cmglee" title="User:Cmglee">Cmglee</a>
<span class="int-own-work" lang="en">Own work</span>