Assertion: mold | /r/HasProperty | difficult
Facets:
Source sentences:
text: Mold can grow on or fill in the empty spaces and crevices of porous materials, so the mold may be difficult or impossible to remove completely.
text: Mold can grow on or fill in the empty spaces and crevices of porous materials, so the mold may be difficult or impossible to remove completely.
text: Similarly if the mold has matured and degenerated, it is difficult to recognize since it rubs off the surface leaving only stained spots or patches.
text: To make matters worse, mold can be difficult and expensive to remove.