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I take it these are the letters as they are printed. It would be interesting to see their IPA equivalents, if known.
Rotokas isn't actually written by the Rotokas people, so far as I am aware, so speaking of a "Rotokas alphabet" is rather disengenuous. Also, it is R-D that are allophones, not G-S!
IPA equivalents would be difficult. With an inventory this small, there's a lot of variation: /b/ varies through [b], [v], [m], and a lot of phones in between, for example. --kwami 22:05, 29 Apr 2005 (UTC)
My apologies. Rotokas does appear to be written, and in a form used by the people themselves, not just unsuccessful attempts by missionaries, unlike some languages. The alphabet has 12 letters for 11 phonemes (not counting long vowels). IPA equivalents are given in the Rotokas language page. kwami 00:27, 2005 Jun 14 (UTC)