DIR xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Coordinate Plane Closure (2735)
        
       Image:
       coordinate_plane_closure.png
        
       3D graphs that don't contact the plane in the closure area may
       proceed as scheduled, but be alert for possible collisions with
       2D graph lines that reach the hole and unexpectedly enter 3D
       space.
        
       Comics reproduced from www.xkcd.com under license.
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