4.  <, >, = .
3000........9000    6000...........8000    7000 - 2000............4000
4000..........400      800...........1000    3000+ 5000............8000
  800..........7000    300.............100    6000+ 4000..........10000


5 . Find the shortest way for the postman.You can use the  roads more than once.

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