of a set of permutations \documentclass[12pt]{minimal}
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\begin{document}\end{document} to be the maximal k such that there exist distinct \documentclass[12pt]{minimal}
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\begin{document}\end{document} that appear in A in all possible linear orders, that is, every linear order of \documentclass[12pt]{minimal}
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\begin{document}\end{document} is equivalent to the standard order of \documentclass[12pt]{minimal}
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\begin{document}\end{document} for at least one permutation \documentclass[12pt]{minimal}
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\begin{document}\end{document}.