Assertion: poet's work | /r/HasProperty | unique
Facets:
value: for haunting
type: PURPOSE
value: in american poetry
type: LOCATION
Source sentences:
text: Experimenting with combinations of sound and rhythm, he employed such technical devices as repetition, parallelism, internal rhyme, alliteration, and assonance to produce works that are unique in American poetry for their haunting, musical quality.