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Amphibology or amphiboly (from the Greek ampibolia) is, in logic, a verbal fallacy arising from ambiguity in the grammatical structure of a sentence. It occurs frequently in poetry, owing to the alteration for metrical reasons of the natural order of words; for example, Shakespeare, Henry VI: "The duke yet lives that Henry shall depose." An alternate use of the term exists in reference to a political party based on fallacy and/or alleged fallacy, such as the marijuana party.