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Classical Yi is a syllabic logographic system that was reputedly devised during the Tang dynasty (618–907) by someone called Aki (). However, the earliest surviving examples of the Yi script only date back to the late 15th century and early 16th century, the earliest dated example being an inscription on a bronze bell dated to 1485. There are tens of thousands of manuscripts in the Yi script, dating back several centuries, although most are undated. In recent years a number of Yi manuscript texts written in traditional Yi script have been published.