Assertion: concussion | /r/CapableOf | happen after blow
Facets:
value: to the head
type: MANNER
value: usually
type: TEMPORAL
Source sentences:
text: Concussion is a mild traumatic brain injury that usually happens after a blow to the head.
text: A concussion happens only with a blow to the head.
text: Concussion is a mild traumatic brain injury that usually happens after a blow to the head.