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

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發送短信 : Green's relations and partial orders on semigroups of partial linear transformations with restricted range