I've never seen it put quite like this before..
http://www.pps.k12.or.us/schools-c/p...sm_am/venn.htm
*cough-Portland Public Schools Oregon-cough*
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http://www.pps.k12.or.us/schools-c/p...sm_am/venn.htm
*cough-Portland Public Schools Oregon-cough*
More...