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That website you gave has a bunch of supposed sign languages that are not even real languages. Home signs are gestures not a language, pigeon sign is made up, I could go on and on.
Its a bit insulting to the deaf to equate made up gestures with an actual language, the languages of the deaf, like ASl.
Oh, and besides, wikipedia has never been creditable as anyone can edit it with any type of information they wish. They have actually done research on the wikipedia site and found that it has more errors and mistakes then it does fact.
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