發送短信 : Primitive substitution tilings with rotational symmetries

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