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The first system of dictionary organization is by semantic categories. The circa 3rd-century BCE Erya ("Approaching Correctness") is the oldest extant Chinese dictionary, and scholarship reveals that it is a pre-Qin compilation of glosses to classical texts. It contains lists of synonyms arranged into 19 semantic categories (e.g., "Explaining Plants", "Explaining Trees"). The Han dynasty dictionary Xiao Erya ("Little Erya") reduces these 19 to

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