Mangar, a Chadic language of the Ron group, is clearly different enough from Daffo-Butura (and other Ron languages) to be a separate language ( Blench, Roger 2003 ) and is duly listed as a separate language in informed reference works ( Jungraithmayr, Herrmann 1981 ). It is missing from E16/E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27.