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Four-Corner Method : ウィキペディア英語版 | Four-Corner Method
The Four-Corner Method () is a character-input method used for encoding Chinese characters into either a computer or a manual typewriter, using four or five numerical digits per character. The Four-Corner Method is also known as the Four-Corner System. The four digits encode the shapes found in the four corners of the symbol, top-left to bottom-right. Although this does not uniquely identify a Chinese character, it leaves only a very short list of possibilities. A fifth digit can be added to describe an extra part above the bottom-right if necessary. == Origin == The Four-Corner Method was invented in the 1920s by Wang Yunwu (王雲五), the editor in chief at Commercial Press Ltd., China. Its development was based mainly on contributions by the Russian scholar Otto Rosenberg〔Karenina Kollmar-Paulenz (ed.). "Otto Ottonovich Rosenberg and his Contribution to Buddhology in Russia," Wiener Studien zur Tibetologie und Buddhismuskunde. Heft 41, 1998.〕 in the early 20th century, as well as experiments by Lin Yutang and others. Its original purpose was to aid telegraphers in looking up Chinese telegraph code (CST) numbers in use at that time from long lists of characters. This was mentioned by Wang Yunwu in an introductory pamphlet called Sijiaohaoma Jianzifa in 1926. Introductory essays for this pamphlet were written by Cai Yuanpei and Hu Shi.
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