Assertion: boom | /r/CreatedBy | a f-4 flying
Facets:
Source sentences:
text: The boom was produced by a F-4 flying just above the speed of sound at an altitude of 100 feet.
text: The boom was produced by an F-4 flying just above the speed of sound at an altitude of 100 feet (30 m).
text: The boom was produced by a F-4 flying just above the speed of sound at an altitude of 100 feet.