Assertion: porcupine's quill | /r/HasAspect | barb
Facets:
value: on the tips
type: LOCATION
value: on them
type: LOCATION
Source sentences:
text: The quills have barbs on the tips that cause them to burrow deeper into the skin and make them hard to remove
text: Some quills have scales or barbs that make them very hard to remove.
text: Quills have barbs that you can see them with a naked eye.
text: The quills have scales and barbs at the tips that make them hard to remove.
text: The quills have barbs and will work their way in deeper if left alone.
text: Quills have barbs that cannot be seen by the naked eye.
text: The quills are very sharp and needle-like and have barbs on them that make it difficult and painful to pull them out.