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Types of sign languages
Sign language is not universal. Like spoken languages, sign languages emerge naturally in communities and change through time. It is not a universal language. Language contact is common, making clear family classifications difficult — it is often unclear whether lexical similarity is due to borrowing or a common parent language. Contact occurs between sign languages, between signed and spoken languages and between sign languages and gestural systems used by the broader community. There are at least 25 sign languages in Africa, according to researcher Nobutaka Kamei.Some have distributions that are completely independent of those of African spoken languages. At least 13 foreign sign languages, mainly from Europe and America, have been introduced to at least 27 African nations; some of the 23 sign languages documented by Kamei have originated with or been influenced by them
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There are a number of sign languages that emerged from French Sign Language (LSF), or were the result of language contact between local community sign languages and LSF. These include: French Sign Language, Quebec Sign Language, American Sign Language, Irish Sign Language, Russian Sign Language, Dutch Sign Language, Flemish Sign Language, Belgian-French Sign Language, Spanish Sign Language, Mexican Sign Language and others.
- A subset of this group includes languages that have been heavily influenced by American Sign Language (ASL), or are regional varieties of ASL. Bolivian Sign Language is sometimes considered a dialect of ASL. Thai Sign Language is a mixed language derived from ASL and the native sign languages of Bangkok and Chiang Mai, and may be considered part of the ASL family. Others possibly influenced by ASL include Ugandan Sign Language, Kenyan Sign Language, Philippine Sign Language and Malaysian Sign Language.
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According to a SIL report, sign languages of Russia, Moldova and Ukraine share a high degree of lexical similarity and may be dialects of one language, or distinct related languages. The same report suggested a "cluster" of sign languages centered around Czech Sign Language, Hungarian Sign Language and Slovakian Sign Language. This group may also include Romanian, Bulgarian, and Polish sign languages.
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Sign languages of Jordan, Lebanon, Syria, Palestine, and Iraq (and possibly Saudi Arabia) may be part of a sprachbund, or may be one dialect of a larger Eastern Arabic Sign Language.
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