Assertion: porcupine's quill | /r/CapableOf | cover side
Facets:
value: to provide a natural protection
type: PURPOSE
Source sentences:
text: Porcupines are well known for their pointy quills, which cover their backs, sides and tail to provide a natural protection against predators.
text: barbed quills protect the back, sides, and tail; long, stiff guard hairs cover the front upper part of the body.