Assertion: basketball | /r/HasAspect | precise and fully known origin
Facets:
value: unlike most sports
type: OTHER
value: surprisingly
type: MANNER
value: very
type: DEGREE
Source sentences:
text: Surprisingly, unlike most sports whose origins are somewhat obscure, often being the combination of other sports and developed gradually through time, basketball has a very precise and fully known origin (the inventor himself wrote an account of it, published after his death; see the “Sources and Further Reading” below).