How to Do a Sleeper With a Yo Yo: 14 Steps (with Pictures)
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YoYoExpert Blog & Yo-Yo News – C3 BTH RELEASED || EPIC LONG SLEEPER || @C3yoyodesign
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How to Do a Sleeper With a Yo Yo: 14 Steps (with Pictures)
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newtonian mechanics - Why does a Yo-Yo sleep, and then awaken? - Physics Stack Exchange