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  _  __     ___     __   __   _    _    _    _   
 | |/ //   / _ \\   \ \\/ // | || | || | || | || 
 | ' //   | / \ ||   \   //  | || | || | || | || 
 | . \\   | \_/ ||   / . \\  | \\_/ || | \\_/ || 
 |_|\_\\   \___//   /_//\_\\  \____//   \____//  
 `-` --`   `---`    `-`  --`   `---`     `---`

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發送短信 : A note on the monotonicity of the ES-algorithm