Kera language
Kera is an East Chadic language spoken by 45,000 people in Southwest Chad and 6,000 people in North Cameroon. It was called "Tuburi" by Joseph Greenberg, a name shared with Tupuri. In Cameroon, Kera is spoken by small, isolated and scattered groups in the southern departments of Mayo-Danay (Wina commune) and Diamaré (Ndoukoula district) in the Far North Region. It is mainly spoken in Chad. In Cameroon, the main group is near the border, south of Viri. There are about 6,000 speakers in Cameroon. Grammar. Kera is a subject–verb–object language, using prepositions. It uses exclusively  borderline case-marking. Phonology. The phonetic symbols and charts used are from the International Phonetic Alphabet (IPA) Vowels. Kera's vowels are, including allophones: But can also be expressed as: Kera has vowel harmony. In Kera, many words are required to only have vowels in the high or not high vowel class. For example, a word may have any of the vowels i ə u or any of the vowels e a o, but words containing both, e.g. words with i and o, are prohibited.