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It felt to me like this page should mention permutation classes, so I went ahead and added such a reference. Given that the top-level headings of the page were topology, graph theory, problem solving, model theory, matroid theory, and set theory, it wasn't clear to me the best way to add this reference. Perhaps others have better ideas. Vince Vatter (talk) 17:36, 4 January 2021 (UTC)