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The Yi script was originally logosyllabic like Chinese and dates to at least the 13th century. There were perhaps 10,000 characters, many of which were regional, since the script had never been standardized across the Yi peoples. A number of works of history, literature and medicine, as well as genealogies of the ruling families, written in the Old Yi script are still in use and there are Old Yi stone tablets and steles in the area.