ɐnˈʌðɚɹ ɪz ðˌɐɾɪt ɪz ɐ fˈiːtʃɚɹ ʌv lˈæŋɡwɪdʒᵻz fɹʌmðɪ ˈɛɹiə ɪnwˌɪtʃ ðə dˈɔːɾɚ lˈæŋɡwɪdʒᵻz ʌv pɹˈoʊɾoʊˌænɐtˈoʊliən wɜː spˈoʊkən.
Another is that it is a feature of languages from the area in which the daughter languages of Proto-Anatolian were spoken.