Assertion: ballad | /r/HasProperty | structured in short stanzas
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Source sentences:
text: Most ballads are structured in short stanzas, often the quatrain form that has come to be known as “ballad measure”—alternating lines of iambic tetrameter (four stressed beats, da DUM da DUM da DUM da DUM) and iambic trimeter (three stressed beats, da DUM da DUM da DUM), rhyming the second and fourth lines of each stanza.