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There is a case of lottery balls on Taobao: http://taobaofed.org/blog/2016/01/18/how-does-the-ball-falling-into-the-appointed-hole/
But there is no demo. You can refer to it
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There is a case of lottery balls on Taobao:
http://taobaofed.org/blog/2016/01/18/how-does-the-ball-falling-into-the-appointed-hole/
But there is no demo. You can refer to it