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1. |
[n]
{mathematics}
▶ four-color problem ▶ four-color map problem |
2. | A 2022-02-03 00:36:30 Jim Breen <...address hidden...> | |
1. | A* 2022-01-31 11:47:59 Robin Scott <...address hidden...> | |
Refs: | gg5, daij, koj https://www.britannica.com/science/four-color-map-problem |