Assertion: gull's underpart | /r/HasProperty | gray back and white
Facets:
value: back
type: OTHER
Source sentences:
text: This medium-sized gull has a gray back and white underparts.
text: Ring-billed Gull: This medium-sized gull has gray upperparts and white underparts.
text: The adult has grey upperparts and white underparts; its wingtips are black above and pale below.
text: This medium-sized gull has a gray back and white underparts.
text: Ring-billed Gull: This medium-sized gull has gray upperparts and white underparts.