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A path in an edge-colored graph is called rainbow if no two edges of it are colored the same. For an ℓ-connected graph G and an integer k with 1≤k≤ℓ, the rainbow k-connection number rck(G) of G is defined to be the minimum number of colors required to color the edges of G such that every two distinct vertices of G are connected by at least k internally disjoint rainbow paths. Fujita et al. proposed...
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