McGregor Map -- from Wolfram MathWorld
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The Four Color Theorem
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Solved Here is a 'counter-example to the 4 color theorem'. | Chegg.com
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File:Four color theorem map of Germany 2.png - Wikimedia Commons
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![PDF] Spiral chains: A new proof of the four color theorem | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/1fc91cead45226ec60415f6fe0d5ffefdd96dba2/5-Figure2-1.png "PDF] Spiral chains: A new proof of the four color theorem | Semantic Scholar")