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

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Text this: A branch-and-cut algorithm for the two-echelon capacitated vehicle routing problem with grouping constraints