發送短信 : Number theory and the periodicity of matter

  ______     ___     _    _     ______   _    _   
 /_   _//   / _ \\  | |  | ||  /_   _// | || | || 
 `-| |,-   | / \ || | |/\| ||   -| ||-  | || | || 
   | ||    | \_/ || |  /\  ||   _| ||_  | \\_/ || 
   |_||     \___//  |_// \_||  /_____//  \____//  
   `-`'     `---`   `-`   `-`  `-----`    `---`