The Japonic language of Hachijō, which is not particularly closely related to the Okinawan languages and not intelligible to mainland Japanese ( David Iannucci 2019: 101-102 , Michinori Shimoji 2022: 1 ) is missing from E16/E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27/E28 ( Kokuritsu Kokugo Kenkyūjo 1950 ).
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Glottolog
Hachijo at Endangered Languages Project