Assertion: purple's mattress | /r/HasProperty | covered by warranty
Facets:
Source sentences:
text: Mattresses are covered by warranty only if they are used on a firm, flat, non-spring foundation (whether non-moving type or adjustable type) sufficiently strong to remain flat and firm under the weight of the mattress and its users, from the date of delivery onward to the date of the warranty claim without interruption; otherwise the warranty is void.