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Formal proof of the Four Color Theorem [maintainer=@ybertot]

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Current version has two duplicate-clear warnings that require a little more thinking.

Hello. trying to install, and have this problem. not sure If it really comes from mathcomp ... can you help me please? ![image](https://github.com/user-attachments/assets/79181912-5aa5-4cf7-9616-dabd68e0880b)