Assertion: porcupine's quill | /r/HasProperty | dense
Facets:
value: as 150 quills per square inch
type: OTHER
Source sentences:
text: Porcupine quills may be as dense as 150 quills per square inch (6.4 square centimeters).
text: They are covered with dense quills, except for their large noses, bellies and the end half of their tails.