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Davenport–Schinzel sequences are a concept in combinatorial geometry and discrete mathematics. They provide a way to count sequences of certain elements that meet specific restrictions. The main idea is to consider sequences formed from a finite set of symbols, where certain pairs of symbols cannot appear as consecutive terms in the sequence. ### Definition A **Davenport–Schinzel sequence** is defined over a set of symbols and contains restrictions on how symbols can be repeated.

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