A four-corner system dictionary uses the four-corner input method (four numerical digits per character) for readers to look up Chinese characters in the dictionary. The four corner method was popular with the time when many Chinese were illiterate and the language was not yet unified. Today, it is still useful for scholars, clerks, editors, compilers, and especially for foreigners who read Chinese. The tenth edition of A New Dictionary of Four-Corner System (Sijiao Haoma Xin Cidian) contains 11,900 Chinese characters and more than 23,700 words or phrases.
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