20E34 20F22 4 20E28 3 20E32 3 20F19 3 abnormal subgroups 3 pronormal subgroups 3 soluble group 3 20E15 2 20F50 2 finite special rank 2 locally nilpotent radical 2 locally nilpotent residual 2 periodic group 2 subnormal subgroup 2 transitively normal subgroups 2 20E25 1 20F16; Secondary 20E25 1 20F16; Secondary: 20E25 1 20F19,20F22 1 Carter subgroups 1 FC-hypercentral 1 Hall subgroup 1 Hirsh-Zaitsev rank 1 Primary 20E15 1 Primary 20H25; Secondary 20F29 1 Primary: 20E15 1 Schmidt subgroup 1 arrangement of subgroups 1 augmentation dimension 1