Sobre el diptongo ortográfico

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                            [a] => The Ortografía de la lengua española (RAE, 2010) defines the notions of diphthong  and hiatus, not with phonetic criteria, but with orthographic criteria. Despite the criticisms, this proposal has been a great theoretical and practical contribution; not only  because it has had important precedents, but also because it is based on phonological  criteria. The morphological frontier is not relevant in the orthographic determination  of diphthongs.
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