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 |__  //  | || | ||   / ___//   / _ \\    ____    
   / //   | || | ||   \___ \\  / //\ \\  |    \\  
  / //__  | \\_/ ||   /    // |  ___  || | [] ||  
 /_____||  \____//   /____//  |_||  |_|| |  __//  
 `-----`    `---`   `-----`   `-`   `-`  |_|`-`   
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Text this: Copula approach for pairs-trading