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  ____       ___     _    _      ___     _    _   
 |  _ \\    / _ \\  | |  | ||   / _ \\  | || | || 
 | |_| ||  | / \ || | |/\| ||  | / \ || | || | || 
 | .  //   | \_/ || |  /\  ||  | \_/ || | \\_/ || 
 |_|\_\\    \___//  |_// \_||   \___//   \____//  
 `-` --`    `---`   `-`   `-`   `---`     `---`

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發送短信 : Dynamic pricing with two revenue streams