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  ____      ______    ____      _____     _____   
 |  _ \\   /_   _//  |  _ \\   |  ___||  /  ___|| 
 | |_| ||   -| ||-   | |_| ||  | ||__   | // __   
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 |_|\_\\   /_____//  |_|\_\\   |_____||  \____//  
 `-` --`   `-----`   `-` --`   `-----`    `---`

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Text this: How the attitude of commuters affects the effectiveness of natural surveillance in MRT stations.