發送短信 : Color symmetry approach to the construction of crystallographic flat origami

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