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As soon as someone knows you’re a ninja, you’re not a ninja.
If you know how to make a circle eight-sided transforming shuriken, you are a certified ninja.
https://www.wikihow.com/Make-an-Origami-Transforming-Ninja-Star
(I love playing with these when I was in school, it was my fidget spinner before fidget spinners became a thing)
Less than 1%
It should match the amount of wood a woodchuck would chuck.
Why not check out some real ninjas and see how it’s done?