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| Oniwaban |
Go (Jap.) means 'five', kan (Chin.) means 'spy' -Gokan: five (types of) spies, also called Tókan or Wujián. These are the five types of spies discussed by Sun Tzu in the 13th Chapter of his book Bingfa- Art of War and are supposedly defined so since the time of Huángdi -Yellow Emperor of China. Master Natori Masatake also describes these five types of spies in his book Shoninki.