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puzzly
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Small 4-chromatic coin graphs
great, sounds convincing enough, except that i don't see (at least not without a bit of geometry) how |V(G)-V(C)|\geq 2 implies |V(C)|\geq 8. did u have in mind a trivial way to see that?
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Small 4-chromatic coin graphs
if i understand correctly, your second construction is a matchstick graph, but not a coin graph, right?
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Small 4-chromatic coin graphs
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