Oluʼbo or Lolubo is a Central Sudanic language spoken by 33,000 Oluʼbo people in Southern Sudan.
Vowels form two vowel harmony sets, based on advanced and retracted tongue root.
[4] There is a tenth vowel quality [ɤ], which only occurs after /u/.
[5] Oluʼbo has high /˦/, mid /˧/, and low /˨/ tones.There are also six compound tones, low-mid /˨˧/, low-high /˨˦/, mid-low /˧˨/, mid-high /˧˦/, high-low /˦˨/, and high-mid /˦˧/.
You can help Wikipedia by expanding it.This Nilo-Saharan languages–related article is a stub.