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... said, “Three is enough, right?”
Shi Xi paused. She really didn’t expect Nan Wan to say such a thing.
Bai Cangyang pondered and said, “I think at least five is needed, right? Are four colors enough?”
“It is impossible to construct five or more two-connected areas in a two-dimensional plane, so five colors are enough,” Professor Qiao said. “Predecessors used computers to prove the four-color theorem, but there is no simpler written proof. If I can prove this, maybe I can t ...
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