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This merger is thought to have happened in the 5th-4th centuries BC. More specifically, it's a monophthongization, in which [ei ou] became [e: o:]. ("Genuine/spurious diphthongs" is a bit of a misnomer -- in Classical Greek, ΕΙ ΟΥ are not diphthongs but digraphs which stand for long vowels; some of these long vowels historically developed from ...

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