The 13 base consonant letters of the Roro alphabet — B, D, G, H, K, L, M, N, P, R, S, T, V. The velar nasal ng appears as a digraph and is characteristic of Oceanic languages of Papua New Guinea.
The ng digraph in Roro represents the velar nasal sound — as in English "sing". This sound is written as a two-letter digraph in the Latin orthography and is a characteristic feature of Oceanic languages in the region.
The five vowel letters of Roro — A, E, I, O, U. This five-vowel system is shared with most Oceanic and Polynesian languages and reflects the Proto-Oceanic vowel inventory.
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