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

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