20D20 11 20D10 8 20D15 3 finite group 3 Finite group 2 maximal subgroup 2 p-nilpotent 2 saturated formation 2 05C25 1 2-maximal subgroup 1 20B35 1 20D25 1 20D35 1 20E22 1 20E28 1 20F16 1 Cayley graphs 1 PST-group 1 S-permutable subgroup 1 S-quasinormal subgroup 1 Schmidt subgroup 1 Sylow \(p\)-subgroup 1 Sylow subgroup 1 \(K\)-lattice saturated formation 1 \(\cal F\) -critical group,\(\cal F\) -maximal subgroup 1 \(\cal F\)-hypercentre 1 \(\pi\)-Hall subgroup 1 \(\pi\)-soluble group 1 \(\sigma\)-nilpotent group 1 \(\tau\)-closed \(\omega\)-composition 1