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What Are Vowels? Definition and Examples - Grammarly
Vowel - Wikipedia
The 20 vowels sounds in English with examples - English Phonetics
Vowels - Grammar Monster
The Guide to English Vowel Sounds - Pronunciation with Emma
Vowels and Vowel Sounds in English with Examples - BYJU'S
Vowel Letters - Definition and Teaching Tips - Twinkl
Vowel - Simple English Wikipedia, the free encyclopedia
Definition and Examples of Vowels in English - ThoughtCo
What are Vowels in English Grammar? - Leverage Edu