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  ____      / _ \\  |      \\   / _ \\    ____    
 |    \\   / //\ \\ |  --  //  / //\ \\  |    \\  
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 |_|`-`   `-`   `-` `------`  `-`   `-`  |_|`-`   
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發送短信 : Measurement of construction productivity : application and computer simulation