Assertion: helicopter | /r/HasProperty | chopper
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: A helicopter (also often used: chopper or heli) is a kind of flying machine or aircraft.
text: Helicopters are also known as copters, choppers, helos, and whirlybirds.
text: Helicopters are also known as copters, choppers, helos, and whirlybirds.
text: Helicopters are sometimes called choppers.
text: A helicopter (also often used: chopper or helo) is a kind of flying machine or aircraft.
text: Helicopters are also known as copters, choppers, helos, and whirlybirds.
text: Helicopters are also known as copters, choppers, helos, and whirlybirds.