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 _    _      ___     _    _     _____             
| || | ||   / _ \\  | \  / ||  |  ___||     ___   
| || | ||  | / \ || |  \/  ||  | ||__      /   || 
| \\_/ ||  | \_/ || | .  . ||  | ||__     | [] || 
 \____//    \___//  |_|\/|_||  |_____||    \__ || 
  `---`     `---`   `-`  `-`   `-----`      -|_|| 
                                             `-`

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發送短信 : Generalized hypersubstitutions of many-sorted algebras