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answered 2024-04-03 13:49:25 +0100
To obtain (representatives of conjugacy classes of) subgroups of low index $\leqslant k$ you can do [G.subgroup(gap_group=H) for H in G.gap().LowIndexSubgroups(k)].
[G.subgroup(gap_group=H) for H in G.gap().LowIndexSubgroups(k)]