Mandage or Magalbe dialect. Kotoko is spoken
to the south of Lake Chad in the Nigeria-Cameroun-Chad
border region. Kotoko is tonal, with 60% of all items
low-toned. Extra high tone has limited distribution, a
low-falling tone occurs only in final syllables. Bouny's
analysis is tentative on several points. Higher mid and
lower mid vowels may turn out to be predictable variants.
Many consonant clusters including geminate plosives occur
medially and are interpreted as heterosyllabic but
sonorants can appear long syllable-finally. Bouny treats
the voiceless ejective affricates as consonant sequences
but they can appear initially and as C2 in -VC1C2V- where
they initiate the second syllable. They also complete an
ejective series which is otherwise missing labial and
coronal terms. On the other hand, prenasalized stops
intervocalically are divided VN.CV and so are treated here
as sequences even in initial position.

Bouny, P. 1977. Inventaire phonetique d'un parler Kotoko:
le Mandague de Mara. Etudes Phonologiques Chadiennes,
Caprile.