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           __   __    _____    __   __     _____  
    ___    \ \\/ //  /  ___||  \ \\/ //   / ___// 
   /   ||   \ ` //  | // __     \ ` //    \___ \\ 
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    -|_||    `-`'     `---`      `-`'   `-----`   
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Text this: Dynamics of a Rotating Sphere on Free Surface of Vibrated Granular Materials