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This article seems to deal with two different diacritics - one is a tonal mark in Vietnamese, the other used in the IPA and in African languages. I myself am no expert (and don't even know the right terms for these two different diacritics), so I'm not doing it myself, but this should be split to two different articles. 22.214.171.124 (talk) 21:56, 21 January 2010 (UTC)