As of 2023, widely accepted sound correspondences between the different branches have not yet been firmly established.
æz ʌv tˈuː θˈaʊzənd twˈɛnti θɹˈiː, wˈaɪdli ɐksˈɛptᵻd sˈaʊnd kˌɔːɹɪspˈɑːndənsᵻz bᵻtwˌiːn ðə dˈɪfɹənt bɹˈæntʃᵻz hɐvnˌɑːt jˈɛt bˌɪn fˈɜːmli ɪstˈæblɪʃt.