Assertion: sign language's system | /r/HasProperty | derived
Facets:
value: from them
type: OTHER
Source sentences:
text: If we do that, then the overall major section would be significant enough within the article that we could include a single sentence in the lede mentioning it, something like "Natural sign languages are distinguished from other systems that are derived from them or otherwise resemble them, such as manual codes for spoken languages, "baby signs", "body language", signs taught to non-human primates, and speculation about use of signs in the early evolution of language.
text: New systems were developed for deaf adults to transition into British Sign Language (BSL), thus causing the pivot in use.[citation needed]