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__    __     ___      ______   __   __            
\ \\ / //   / _ \\   /_   _//  \ \\/ //   ____    
 \ \/ //   | / \ ||    | ||     \ ` //   |    \\  
  \  //    | \_/ ||   _| ||      | ||    | [] ||  
   \//      \___//   /__//       |_||    |  __//  
    `       `---`    `--`        `-`'    |_|`-`   
                                         `-`

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發送短信 : Ramanujan's modular equations and Atkin-Lehner involutions