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Why does the diphthong /aʊ/ not occur before /k/, /m/, /p/, /b/, /g/ etc?
I have noticed that the diphthong /aʊ/ occurs before certain consonants. We have:
/aʊd/ in loud
/aʊt/ in out
/aʊs/ in house
/aʊn/ in town
/aʊtʃ/ in pouch
/aʊl/ in owl
BUT, we don't have /aʊp/, /aʊb/,...
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