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A graph L is called a lantern if it has two adjacent vertices u,v such that all the other vertices of L are adjacent to both u and v, and L has no other edges. Let L be a lantern of order 2n>=8. We prove that any edge-coloring of L using 2n-1 colors can be extended to a proper edge-coloring of K 2n using the same set of colors. This result is used in some of our other papers on edge...
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