Assertion: slate | /r/HasProperty | high quality material
Facets:
value: extremely
type: DEGREE
Source sentences:
text: However, slate is an extremely high quality material that can last for 75 years or more when properly installed and maintained.
text: Slate is a high quality building material, and although different types of slate vary considerably in how much they cost, slate is generally one of the most expensive roofing materials to build with.