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

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發送短信 : Grammar for Teachers: a guide to American English for native and non-native speakers