Assertion: swan's feather | /r/ObjectUse | used as quill
Facets:
value: for writing
type: PURPOSE
Source sentences:
text: Feathers were also used as quills for writing, the leathery web used for purses, and the wing bones for making whistles.
text: Feathers were also used as quills for writing, the leathery web used for purses, and the wing bones for making whistles.