Assertion: gorilla | /r/CapableOf | refer using the sign penny
Facets:
value: to whom
type: TRANSITIVE-OBJECT
Source sentences:
text: He had a working vocabulary of over 600 signs in American Sign Language, taught to him by Koko, a female gorilla; Dr. Francine Patterson (to whom the gorillas referred using the sign "penny"); and other staff of Stanford University.