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Yo-yo
A yo-yo is a toy consisting of two equally sized and weighted discs of plastic, wood, or metal, connected with an axle, around which string is wound. There is a slip knot at the free end of the string, and, on a properly strung yo-yo, an uncut loop around the axle (known as a looped slip-string) which allows it to spin freely, or "sleep" upon reaching the string's end.
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