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Main sound category: Diphthongs
Source vowel: ä : open central unrounded vowel
Target vowel: o : close mid back rounded vowel
IPA symbol: äo
IPA description: open central unrounded vowel to close mid back rounded vowel
UPSID symbol: ao
UPSID description: low central unrounded vowel to higher mid back rounded vowel
Occurs in 1 language
That is in 0.20% of all languages
Occurs in: Bengali_Bangladesh