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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