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2006-10-10 21:06 David Eppstein 324×297×8 (4298 bytes) A 4-[[Edge coloring|edge-coloring]] of a 5-[[Cycle graph|cycle]] such that the sequence of colors on any path forms a [[squarefree word]], showing that the [[Thue number]] of ''C''<sub>5</sub> is four.
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