Mangar, a Chadic language of the Ron group, is clearly different enough from, and not intelligible ( Frank, Barbara 1981: 12 ) to Daffo-Butura, Kulere or other Ron languages and thus constitutes a separate language ( Blench, Roger 2003 ). It is duly listed as such in informed reference works ( Jungraithmayr, Herrmann 1981 , Seibert, Uwe 1994 ). It is missing from E16/E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27/E28.