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Final answer:The lines from Twelfth Night employ various literary devices such as metaphor, allusion, and simile.Explanation:The lines from Twelfth Night employ various literary devices. The line "That most ingrateful boy there, by your side" spoken by Antonio is using a metaphor to compare the boy to an ungrateful person. In Sebastian's line "Let fancy still my sense in Lethe steep, If it be thus to dream, still let me sleep!", there is an example of an allusion to the river Lethe, which is associated with forgetfulness. And in the Duke's line "Methought she purg'd the air of pestilence, That instant was I turn'd into a hart [deer]", we can identify an example of a simile comparing the effect of the woman purging the air to him being turned into a deer.Learn more about literary devices in Twelfth Night here:brainly.com/question/1112652...