Four color theorem - Wikipedia
![The four colour theorem: You need only four colours for a map [2844x1443] [OC] : r/MapPorn](https://external-preview.redd.it/eOMkUTGdH_Y5jhUKPgWltonlb4wLY8ERARVfv_RIGIU.png?width=640&crop=smart&auto=webp&s=578003878132cd860e36fe1a2cf2f41f6143c525 "The four colour theorem: You need only four colours for a map [2844x1443] [OC] : r/MapPorn")
The four colour theorem: You need only four colours for a map [2844x1443] [OC] : r/MapPorn
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