4 ms·

You didn't even try it, did you? Took 10 seconds. https://imgur.com/a/1sdJ6 https://imgur.com/a/1sdJ6

• profosaur 9y ago
  I love that OP was at least willing to provide an example of a planar map that he believed could not be 4-colored. Credit for sticking his neck out.
• yoda222 9y ago
  Red, blue, yellow, green. And white. That's five colors! ;-)