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  1. French Sign Language - Wikipedia

    en.wikipedia.org/wiki/French_Sign_Language

    French Sign Language is frequently, though mistakenly, attributed to the work of Charles Michel de l'Épée (l'abbé de l'Épée). In fact, he is said to have discovered the already existing language by total accident; having ducked into a nearby house to escape the rain, he fell upon a pair of deaf twin sisters and was struck by the richness ...

  2. Plains Indian Sign Language - Wikipedia

    en.wikipedia.org/wiki/Plains_Indian_Sign_Language

    Plains Indian Sign Language (PISL), also known as Plains Sign Talk, Plains Sign Language and First Nation Sign Language, is a trade language, formerly trade pidgin, that was once the lingua franca across what is now central Canada, the central and western United States and northern Mexico, used among the various Plains Nations.

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