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Additionally, there exists the diphthong /ua/. It cannot be lengthened nor nasalised.
Lutos has three tones: high, mid, low.
References
Lutos at Ethnologue (18th ed., 2015) (subscription required)
International Encyclopedia of Linguistics ed.
William J. Frawley · 2003 p303 " In Central African Republic: 17,000 speakers in Nde ́le ́, Kaga Andoro, and Kabo subprefectures. Dialects are Nduka (Ndouka, Ndoukwa), Lutos (Ruto, Routo, Rito, Luto, Louto), Wada (Wad), Nduga (Ngougua), Konga."
^ Olson, Kenneth S. (26 August 2013). A Sketch of Lutos Phonology. 43rd Colloquium on African Languages & Linguistics. Leiden.