Assertion: rhino's horn | /r/HasProperty | human fingernails
Facets:
Source sentences:
text: The horn is pure keratin, like human fingernails, and starts to show after about six years.
text: The black horn is pure keratin, like human fingernails, and starts to show after about six years.
text: The horn is pure keratin, like human fingernails, and starts to show after about six years.