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Parabola-focus-directrix.png
Parabola-focus-directrix.png
http://commons.wikimedia.org/wiki/Special:FilePath/Parabola-focus-directrix.png
parabola
P18
Q48297-1A498608-5BA4-4C68-B29F-B29A46A9746B
P18
Parabola-focus-directrix.png
http://commons.wikimedia.org/wiki/Special:FilePath/Parabola-focus-directrix.png