Oluʼbo language
Olubo or Lolubo is a Central Sudanic language spoken by 33,000 Olubo people in Southern Sudan.
Phonology
Vowels
Vowels form two vowel harmony sets, based on advanced and retracted tongue root. The group is commonly transcribed as, and the group as. is phonetically but is found in roots of both sets.There is a tenth vowel quality, which only occurs after. When and are in separate morphemes, is in free variation with.