We define the family of n-gram embeddings from strings over a finite alphabet into the semimodule N^K. We classify all x in N^K that are valid images of strings under such embeddings, as well as all x whose inverse image consists of exactly 1 string (we call such x uniquely decodable). We prove that for a fixed alphabet, the set of all strings whose image is uniquely decodable is a regular language.

11 pages

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