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Hands
if you are talking about wc 2009 then play story mode up to where blister Luna and Leo teach you about td it should now be unlocked
if mean as an ordinary jutsu, you start the game with it, i think...
no unless you wanna learn about how a person dies in a trench that's all ww1 was myb if you studied ww2 how a person is in survival mode.
Traditionally speaking, Minecraft is not an educational game.