20D10 5 20E34 5 soluble group 5 20E28 4 20F16 4 20E15 3 20F19 3 20F22 3 20F50 3 radical group 3 20D15 2 20D20 2 20D25 2 20E32 2 20H25 2 finite group 2 finite special rank 2 locally nilpotent radical 2 locally nilpotent residual 2 locally soluble group 2 locally soluble groups 2 periodic group 2 soluble groups 2 subnormal subgroup 2 transitively normal subgroups 2 05C25 1 2-generator groups 1 20-00 1 20B07 1 20C07 1