Assertion: english diphthong | /r/CapableOf | maintain their coherence
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text: As an example, the English diphthongs are usually considered single phonemes because they (mostly) originated historically as monophthongs, alternate with monophthongs in pairs such as divine vs. divinity, maintain their coherence when another vowel follows, and other, similar-looking diphthongs like [/eu/] do not exist in the language.[citation needed]