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       xkcd - A Webcomic - Pi vs. Tau (1292)
        
       Image:
 (PNG) pi_vs_tau.png
        
       Conveniently approximated as e+2, Pau is commonly known as the
       Devil's Ratio (because in the octal expansion, '666' appears four
       times in the first 200 digits while no other run of 3+ digits
       appears more than once.)
        
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