(DIR) xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Euler Diagrams (2721)
        
       Image:
 (PNG) euler_diagrams.png
        
       Things Leonhard Euler created ( most of math ( overlapping circle
       diagrams ) a cricket bowling machine ) Things John Venn created
        
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