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If two or three strong vowels are together, they do not produce the single diphthong or triphthong sound and are instead pronounced as separate syllables: fea, leo, lee, peleándose and Isaac should be pronounced, Is-a-a-c.
It does look more like a triphthong than a diphthong, but the middle sound is high-central or even high-back.
Words such as course and force are sometimes realized with a triphthong //, especially among older speakers.
For one, there is no such thing as a triphthong in Latin.
Diphthongs and triphthongs do not come into the picture at all.
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