Based on the definitions provided, here are the correct matches for each poetic form:
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Alliteration: "The repetition of initial consonant sounds in a series of words within a line or stanza."
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Ballad: "A narrative poem often meant to be sung, typically with alternating rhyme and regular meter."
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Epigram: "A short, witty poem that makes a clever or ironic point."
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Sonnet: "A 14-line poem with a specific rhyme scheme and meter."
If you need any more information or clarification on these poetic forms, feel free to ask!