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20.14-15
caecus autem si caeco ducatum praestat ambo in foveam cadunt
https://books.google.it/books?id=Q18hAQAAMAAJ&lpg=PA172&dq=quia%20errav%C3%A9runt%20caeci%20in%20plateis&hl=it&pg=PA172#v=onepage&q=quia%20errav%C3%A9runt%20caeci%20in%20plateis&f=false