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.The meaning of tokan was first revealed during the reign of the Yellow Emperor (Kotei). Then, in the saden the shinobi is called cho. Later, the shinobi is called saisaku. It is said that a person in the service of the King of To secretly entered the King of JoÕs residence and killed him. Also, it is said that Sonwu, a retainer of the King of Wu, used the five types of information gatherers (kan) to plan an attack on the enemy. |
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Five Types of Information Gatherers (kan) Inko-no-kan Nairyo-no-kan |