He assembled a basic list of about 5,000 words originating mainly from the Fulfulde dialect spoken in the Gombe area of Nigeria, but also based rnargin-ally on the "Eastern group" (Adarnawa, Sokkoto, Kano, Eastern Niger) and on the "Western group" (Futa-Jalon, Futa-Toro, Masina, Upper Volta and Western Niger).