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    • On 2 nonsplit extension groups associated with HS and HS:2 

      Moori, Jamshid; Seretlo, Thekiso Trevor (Turkish JournalPark, 2014)
      The group HS:2 is the full automorphism group of the Higman--Sims group HS. The groups 24.S6 and 25.S6 are maximal subgroups of HS and HS:2, respectively. The group 24.S6 is of order 11520 and 25.S6 is of order 23040 and ...