Text this: Optimal network configuration in liner shipping : it's challenges

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