Rebecca Hasselbach-Andee 2021: 136-138
Akkadian, an extinct ancient East Semitic language whose existence is well-known, but not found in E16/E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27 ( Huehnergard, John 1997 , Arthur Ungnad 1992 ).