Assertion: black walnut's shell | /r/HasProperty | hard
Facets:
value: very
type: DEGREE
Source sentences:
text: Black walnuts have tough hull or husk and an extremely hard shell.
text: Black walnuts have a hard shell.
text: As the shell is very hard, you will need a more solid tool than the common nut cracker to get the nut out of the shell!