Normalize subgroup bases?
> 2.6.66.89
That's equivalent to 2.3.11.89.
> 2.20.55.89
That's equivalent to 2.5.11.89.
> 2.12.62.89
That's equivalent to 2.3.31.89
> 2.18.72.89
That's equivalent to 2.9+.9-.89 (with a dual harmonic 9). FloraC (talk) 18:15, 13 June 2023 (UTC)