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A poem is a composition written in verse (although verse has also been used for epic and dramatic fiction).
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Poems make use of the aesthetic qualities of language to suggest differential meanings and to evoke emotive responses. Poems rely heavily on imagery and metaphor; they may have a rhythmic structure based on patterns of stresses (metric feet) or on patterns of different-length syllables (as in classical prosody); and they may or may not utilize rhyme.
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