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Center of dihedral group:D16, Center of dihedral group:D8, Center of semidihedral group:SD16, Center of unitriangular matrix group:UT(3,p), Derived subgroup of nontrivial semidirect product of Z4 and Z4, Normal Klein four-subgroup of symmetric group:S4, Subgroup generated by a non-commutator square in nontrivial semidirect product of Z4 and Z4