Assertion: canyon | /r/HasAspect | opening
Facets:
value: on one side
type: LOCATION
value: on only one end
type: LOCATION
Source sentences:
text: Box Canyon: Canyons that have an opening on only one end are called the box canyons.
text: Canyons within mountains or gorges that only have an opening on one side are called box canyons.