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Most daily newspapers use some form of offset printing. This process etches the image of a newspaper page onto thin aluminum plates. (Pages with color photos or type require extra plates.) ... Instead, the plates transfer their inked image to a rubber roller, which in turn prints the page.
It seems that you have missed the necessary options for us to answer this question, so I had to look for it. Anyway, based on the given lines above, the literary device that Sophocles uses in these lines to keep the audience interested is DRAMATIC IRONY. Hope this helps.
The answer is if we want to be free, we must act.