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... Ortygie; timuit concursibus Argo undarum sparsas Symplegadas elisarum, quae...

'undarum (..) elisarum' - just take another look at this vs : it contains of just 4 words; that a vs contains just 4 words, doesnot often happen in the Metam. ; the words ofcourse are also deliberatly put; one doesnt need rocketscience to discern that ; the rocks themselves (sp. Sym) are surrounded by the splashing waves (und. elis.) ; well done, Ovid!