Assertion: gull's underpart | /r/HasProperty | pure white
Facets:
Source sentences:
text: Underparts are pure white.
text: The underparts and tail are pure white.
text: Underparts are pure white.
text: The upperparts are a deep, glossy brown, while the breast is white and sometimes streaked with brown, and the underparts are pure white.
text: Yellow-legged gulls have pure white underparts with a grey mantle and wings.