Assertion: corn | /r/HasProperty | planted by the native americans
Facets:
value: in hills
type: LOCATION
value: in a complex system
type: LOCATION
Source sentences:
text: Maize was planted by the Native Americans in hills, in a complex system known to some as the Three Sisters.
text: Maize was planted by the Native Americans in hills, in a complex system known to some as the Three Sisters: beans used the corn plant for support, and squashes provided ground cover to stop weeds.