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3 of them. January, February, and August.

A diphthong ( /ˈdɪfθɒŋ/ or /ˈdɪpθɒŋ/;[1] Greek: δίφθογγος, diphthongos, literally "two sounds" or "two tones"), also known as a gliding vowel, refers to two adjacent vowel sounds occurring within the same syllable.

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13y ago

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