Waiwai language

Waiwai (Uaiuai, Uaieue, Ouayeone) is a Cariban language of northern Brazil, with a couple hundred speakers across the border in southern Guyana and Suriname.

Vowels

 * /o/ can be heard as [ʌ] when following palatal consonants /tʃ, ʃ/.
 * /a/ can be heard as [æ] when preceded by sounds /j, tʃ/, and followed by sounds /w, m, s/.