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

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Text this: A contrastive study on grammatical subject as a clause element in English and in Vietnamese from perspective of systemic-functional grammar