A simple Caroll Diagram, (also called "Lewis Caroll's Square"), used for grouping objects in yes/no fashion.
<ul><li>derivative work: <a href="//commons.wikimedia.org/wiki/User:LennyCZ" title="User:LennyCZ">LennyCZ</a> (<a href="//commons.wikimedia.org/wiki/User_talk:LennyCZ" title="User talk:LennyCZ"><span class="signature-talk">talk</span></a>)</li>
<li><a href="//commons.wikimedia.org/wiki/File:Carroll_diagram.png" title="File:Carroll diagram.png">Carroll_diagram.png</a>: <a href="//commons.wikimedia.org/wiki/User:CarrotMan" class="mw-redirect" title="User:CarrotMan">Jake Choules</a></li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Carroll_diagram.png" title="File:Carroll diagram.png">Carroll_diagram.png</a></li></ul>