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A permutation group $G \lt S_n$ is called generously transitive, if for each $i,j$ there exists a permutation that interchanges them. Is there a reasonable classification of such (finite) groups?

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@oeter franek: The problem is that the parser interprets < as an HTML marker; use \lt for < and \gt for >. I've fixed the question. –  Arturo Magidin Feb 28 '13 at 15:54
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I believe the answer is No, there is no good classification of these things. It might be helpful for you to know that a "generously transitive permutation group" is the same as a 2-star transitive group. (See for instance the introduction to "The k-star Property for Permutation Groups" by Clough, Praeger, Schneider.) I can email you a copy of this paper if you need it.

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