AvailableSubgroupsGPL( pres )
AvailableSubgroupGPL( pres ) returns a list of all the subgroups defined in the list pres.subgroups where pres must be a presentation. Note that in general not a complete list of subgroups of the group indicated by name will be returned.
gap> hig := GroupPresentationGPL( "HS", 1);
gap> InitializeGroupPresentationGPL( hig );
gap> AvailableSubgroupsGPL( hig );
[ M22, U3(5).2, U3(5), L3(4).2_1, A8.2, 2^4.s6, 4^3:psl(3,2), M11,
4.2^4:s5, 2xa6.2^2, 5:4xa5 ]