The reason I didn't create these when I created ilo is:
* Samogitian, Banyumasan, Ripuarian, Dutch-Low Saxon: Don't have an
ISO code (nds-nl claims to have one but that looks like a
pseudo-ISO-code)
* Banyumasan, Ripuarian are dialects according to Wikipedia,
Dutch-Low Saxon appears to be some kind of dialect as well.