DIR xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Tick Marks (2918)
        
       Image:
       tick_marks.png
        
       If you're really savvy, you can hide an entire set of illicit
       transactions by timing them to draw what looks like a graph
       inset.
        
       Comics reproduced from www.xkcd.com under license.
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