PlanarGraph4.png (4KB, MIME type: image/png)
image/png
Graphic by en:User:Chas zzz brown, uploaded as PlanarGraph4.png to the :en-Wikipedia by en:User:Chas zzz brown on 11 OCt 2002; 05.11 with the source Graphic for four color map theorem; by me for wiki.
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