Image:4ct-non-counterexample.png
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Date/Time | Dimensions | User | Comment | |
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current | 10:48, 26 April 2006 | 494×491 (7 KB) | Syp | (It is necessary to change the colour of at least four of the ten regions of this map to obtain a proper four-colouring. copied from en:Image:4ct-non-counterexample.png) |
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