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Diphthong - Wikipedia
Diphthong: Explanation and Examples - Grammar Monster
Diphthong Definition and Examples in English - ThoughtCo
What is a Diphthong? (Definition, Examples, Word List)
Diphthong Definition & Meaning - Merriam-Webster
English diphthongs list: Examples, pronunciation, and tips
Diphthong: Definition, Types and Examples of Diphthongs - 7ESL
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