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   DIR xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Proof Without Content (3201)
        
       Image:
       proof_without_content.png
        
       There's also a proof without content of a conjecture without
       content, but it's left as an exercise for the reader.
        
       Comics reproduced from www.xkcd.com under license.
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