In non-final positions, /u//o/, /i/, and /e/ are [ʊ][ɔ], [ɪ], and [ɛ], respectively. /ə/ appears only in nonfinal syllables. When adjacent to nasal consonants, vowels are nasalized; nasalization may also occur when adjacent to word boundaries.[3]
/p/ and /k/ are voiced fricatives ([β] and [ɣ]) respectively) when intervocalic and unreleased when final (/t/ is also unreleased when final). /ŋ/ is a nasal flap ([ɾ̃]) word-initially and between vowels. /s/ is [ts] initially and may otherwise be palatalized[sʲ].[3] Sequences of any consonant and /w/ are neutralized before /u/ where an offglide is always heard.
Phonotactics
Bilabial and velar consonants and /n/ may be followed by /w/ when initial. Other initial clusters include /pr/, /kr/, /hr/, /hw/, and /hn/ and final clusters are /w/ or /j/ followed by any consonant except for /h/ or /ŋ/.[3]
^ abFoley, William A. (2018). "The Languages of the Sepik-Ramu Basin and Environs". In Palmer, Bill (ed.). The Languages and Linguistics of the New Guinea Area: A Comprehensive Guide. The World of Linguistics. Vol. 4. Berlin: De Gruyter Mouton. pp. 197–432. ISBN978-3-11-028642-7.
^Foley, W.A. "Linguistic prehistory in the Sepik-Ramu basin". In Pawley, A., Attenborough, R., Golson, J. and Hide, R. editors, Papuan Pasts: Cultural, linguistic and biological histories of Papuan-speaking peoples. PL-572:109-144. Pacific Linguistics, The Australian National University, 2005.