Assertion: chimpanzee's system | /r/MadeOf | more than 20 individual sounds
Facets:
Source sentences:
text: By remaining in almost constant contact with the chimps, Goodall discovered a number of previously unobserved behaviors: She noted that chimps have a complex social system, complete with ritualized behaviors and primitive but discernible communication methods, including a primitive "language" system containing more than 20 individual sounds.