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__    __    _____    _____      ______    ______  
\ \\ / //  |  ___|| |  __ \\   /_   _//  /_   _// 
 \ \/ //   | ||__   | |  \ ||   -| ||-   `-| |,-  
  \  //    | ||__   | |__/ ||   _| ||_     | ||   
   \//     |_____|| |_____//   /_____//    |_||   
    `      `-----`   -----`    `-----`     `-`'

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發送短信 : Applications of gratings