These codes represent collections of languages. See http://www-01.sil.org/iso639-3/scope.asp. Codes here appear in ISO 639–2 and/or ISO 639–5, not ISO 639–3, so ordinarily working tests should not have these language codes.
- The last working test with a collective code was closed in February 2018.
- Status of the two existing opening projects that using collective codes: Bihari Wikipedia is requesting to be renamed to Bhojpuri Wikipedia (https://bho.wikipedia.org), see phab:T41968; for Nahuatl Wikipedia, it's still under brainstorming to decide which should be the new name and url (probably to be splitted), please join Category talk:Incubator:Nahuatl languages to discuss.