Old Nubian, an extinct but well-attested language of North Sudan and Southern Egypt, is missing from E16/E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27 ( Khalil, Mokhtar M. 1988 , Browne, Gerald M. 2002 , Browne, Gerald Michael 1997 , Zyhlarz, Ernst 1928 ).