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A graph G=(V,E) is a word-representable graph if there exists a word W over the alphabet V such that letters x and y alternate in W if and only if (x,y)∈E for each x≠y.In this paper we give an effective characterization of word-representable graphs in terms of orientations. Namely, we show that a graph is word-representable if and only if it admits a semi-transitive orientation defined in the paper...
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