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Jul 9, 2011 at 7:18 comment added Francesco Polizzi Some families having coindex $4$ were studied by Occhetta, Chierici and Novelli. Look at their papers on the arXiv.
Jul 9, 2011 at 7:00 history edited gio CC BY-SA 3.0
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Jul 9, 2011 at 6:51 history asked gio CC BY-SA 3.0