A Prose poem (n.) is a big box o’ words.
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The Prose poem (n.) is a poem comfortable with the right margin.
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The Prose poem (n.) eschews the line in favor of the sentence.
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A Prose poem (n.) justifies itself by resorting to the right margin.
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The Prose poem (n.) risks going too far because poetry is so held back by the tether of the line.
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The Prose poem (n.) is the language of poetry in its street clothes.