Also see https://github.com/tlaplus/vscode-tlaplus/discussions/271#discussioncomment-13719128
> On Jul 11, 2025, at 8:39 AM, Stephan Merz <stepha...@xxxxxxxxx> wrote:
>
> If you have two symmetry sets X and Y, you can define
>
> Symmetry == Permutations(X) \union Permutations(Y)
>
> I recommend you have a look at section 14.3.4 of Specifying Systems, where this is explained in detail.
>
> Stephan