Ninja - Wikipedia
https://en.wikipedia.org/wiki/Ninja
WEB'one who is invisible'; [ɲiꜜɲdʑa]) or shinobi (Japanese: 忍び, lit. 'one who sneaks'; [ɕinobi] ) was a covert agent , mercenary , or guerrilla warfare expert in feudal Japan . The functions of a ninja included siege and infiltration , ambush , reconnaissance , espionage, deception , and later bodyguarding and their fighting skills in ...
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