(DIR) xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Turtle Sandwich Standard Model (2301)
        
       Image:
 (PNG) turtle_sandwich_standard_model.png
        
       It's possible the bread and shell can be split into a top and
       bottom flavor, and some models additionally suggest Strange Bread
       and Charm Shells.
        
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