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  ____     /_   _//  /_____//  /_   _// |  __ \\  
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 |  __//   /_____//  `__ `     /_____// |_____//  
 |_|`-`    `-----`   /_//      `-----`   -----`   
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發送短信 : Investigation of white LEDs based MIMO visible light communication system