(grammar) change from a simple vowel to a diphthong (also diphthongise)

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{f} diphthongize
(grammar) change from a simple vowel to a diphthong (also diphthongise)

    Расстановка переносов

    (grammar) change from a sim·ple vow·el to a diph·thong (also diphthongise)
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