However, the merging of unstressed Proto-Germanic vowels, attested in runic inscriptions from the 4th and 5th centuries CE, also suggests that Primitive Norse could not have been a direct predecessor of West Germanic dialects.
Nanging, vocal Proto-Jermanik sane kagapukan sane nenten kesarengin  antuk tekanan, sane kabuktiang ring prasasti rahasia abad kaping 4 miwah kaping5, taler nyihnayang inggian norse Primitif nenten pastika ngawitin langsung saking logat Jermanik Kauh.