[5] Yamada et al. (2015) describe the contrast as fortis (unaspirated and tense), lenis (weakly aspirated and lax), and voiced.

[4] In positions other than prevocalic, all nasals are phonetically homorganic with a following consonant (e.g. ng [ŋɡ], nd [nd], nb [mb]).

That is direct evidence of an intermediate stage of the fortition *j- > *z- > d-, leading to the modern name /dunaŋ/ 'Yonaguni'.

Below is the syllable template for Dunan: The onset allows for a single consonant with the occasional presence of a glide.

However, after conquest by the Ryukyu Kingdom and later annexation by the Empire of Japan, the logograms were replaced by Japanese kana and Kanji.