"open vowel" . "opener" . . "low vowels" . "opens" . "open vowels" . . "Open vowel" . "Low vowels" . . . . "lowering" . "Open/Low" . . . "Open vowel" . . "Open / Low" . . . . "Open" . . . . "(Near)Open" . "lower" . "Low" . "open-vowel" . "Close" . "low" . "open" .