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On permutations avoiding 1324, 2143, and another 4-letter pattern

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14 lug 2017
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We enumerate permutations avoiding 1324, 2143, and a third 4-letter pattern τ a step toward the goal of enumerating avoiders for all triples of 4-letter patterns. The enumeration is already known for all but five patterns τ, which are treated in this paper.