發送短信 : Locally strong endomorphisms of paths

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