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Algorithmic Combinatorics on Partial Words
Algorithmic Combinatorics on Partial Words is a 2008 research monograph by Francine Blanchet-Sadri, published by Chapman & Hall/CRC and the first devoted to partial words.
Partial word
A partial word is a finite or infinite sequence over a finite alphabet in which some positions, called holes, are undefined; it extends ordinary words in combinatorics on words.