<p>connections between n (n=4 here) entities avoiding a combinatorial explosion
</p>
Based on <a href="//commons.wikimedia.org/wiki/File:4xn.gif" title="File:4xn.gif">Image:4xn.gif</a>
No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:Booyabazooka" class="mw-redirect" title="User:Booyabazooka">Booyabazooka</a> assumed (based on copyright claims).
2 January 2007 (original upload date)
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