Hi again,

> - A more general solution is to do what Anton proposed. I include a
>   sample script below.

> sym.add_site_family(lat.sublattices[0], other_vectors=[(-1, 2)])
> sym.add_site_family(lat.sublattices[1], other_vectors=[(-1, 2)])

Thanks for this. I had tried do do the following:

        sym.add_site_family(lat, other_vectors=[(-1, 2)])

instead of calling `add_site_family` for each sub-lattice, and it did
not work. I therefore thought that my understanding was flawed, but
it seems that for a polyatomic lattice one has to manually add each
sub-lattice. Maybe a word in the documentation would be useful to
prevent this potential pitfall


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