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  ______     ___      _  _      ___      _____   
 /_____//   / _ \\   | \| ||   / _ \\   /  ___|| 
 `____ `   | / \ ||  |  ' ||  | / \ || | // __   
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 /_//       `---`    `-` -`    `---`     `---`   
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發送短信 : Scheduling customer orders on unrelated parallel machines to minimise total weighted completion time