Assertion: skateboarder's trick | /r/CapableOf | spawn countless variations
Facets:
value: since
type: TEMPORAL
Source sentences:
text: Invented by Matt Barden in 1980, the trick has since spawned countless variations; some people omit the body varial, landing with their front foot on the nose (a "nose M80"), some start rolling fakie, some do a double flip instead of a single one, and some replace the pivot with a fakie bigspin.