Assertion: picket fence's picket | /r/CapableOf | set with a 1x3 spacer
Facets:
value: to keep them
type: PURPOSE
value: between them
type: LOCATION
Source sentences:
text: Install the remaining pickets using the same method used to build the sections, one at a time and set with a 1x3 spacer between them and a board along the top to keep them properly aligned.