Assertion: warthog's mouth | /r/HasProperty | opened
Facets:
Source sentences:
text: There are two pairs: the shorter, lower pair are worn to a razor-sharp edge by rubbing against the longer, upper pair whenever the mouth is opened and closed.
text: The lower pair, which is far shorter than the upper pair, becomes razor-sharp by rubbing against the upper pair every time the mouth is opened and closed.
text: The lower tusks are worn to a sharp cutting edge by rubbing against the longer, upper pair whenever the mouth is opened and closed.
text: Lower tusks are shorter than the upper and both are kept razor sharp by constant meshing when the mouth is opened and closed.
text: The lower pair, which is far shorter than the upper pair, becomes razor sharp by rubbing against the upper pair every time the mouth is opened and closed.
text: The lower pair, which is far shorter than the upper pair, becomes razor sharp by rubbing against the upper pair every time the mouth is opened and closed.