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Dan. The dan ( 段) ranking system is used by many Japanese, Okinawan, Korean, and other martial arts organizations to indicate the level of a person's ability within a given system. Used as a ranking system to quantify skill level in a specific domain, it was originally used at a Go school during the Edo period. [1]
Population by province-level division Fifth National Census long form Fifth National Census temporary residence form. Based on the results of the Fifth National Population Census, Henan was the most populous province-level division, Shandong was ranked second, Guangdong and Sichuan were third and fourth, and Jiangsu, Hebei, Hunan, Hubei, Anhui, and Zhejiang were ranked fifth through tenth.