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In page Dactylic hexameter:

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Here the word ἔπος (epos) was originally ϝέπος (wepos) in Ionian; the digamma, later lost, lengthened the last syllable of the preceding εἶπας (eipas) and removed the apparent defect in the meter. A digamma also saved the hiatus in the third foot. This example demonstrates the oral tradition of the Homeric epics that flourished before they were written down sometime in the 7th century BC[citation needed].