Derives from deaf schools founded around 1900 either influenced by or derived from Italian Sign Language ( Manrique Cordeje, María Elizabeth 2017: 27-28 , María Ignacia Massone and Rocío Anabel Martínez 2015: 73-75 ). Since there is no assertion that it does derive from an Italian Sign Language of the early 1900s it is a presumed isolate. A systematic lexical investigation remains to be done.
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