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They're dominant in Douai, but rarer in Rhyl (6)

Ross

I believe the answer is:

vowels

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(Other definitions for vowels that I've seen before include "A e i o u" , "Speech sounds made with the vocal tract open" , "aeiou" , "Five speech sounds" , "'Five letters, not consonants (6)'" .)

I've seen this clue in the Evening Standard.
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