Assertion: box spring | /r/CapableOf | offer flush surface
Facets:
value: to help
type: PURPOSE
Source sentences:
text: Sagging and indentation is an issue with many mattresses, but box springs offer a flush surface to help the mattress maintain its shape over time.
text: Sagging and indentation is an issue with many mattresses, but box springs offer a flush surface to help the mattress maintain its shape over time.