code: def make_inst2():
      
      I,d = multidict({1:45, 2:20, 3:30 , 4:30}) # demand
      J,M = multidict({1:35, 2:50, 3:40})        # capacity
      c = {(1,1):8,    (1,2):9,    (1,3):14  ,   # {(customer,factory) : cost<float>}
           (2,1):6,    (2,2):12,   (2,3):9   ,
           (3,1):10,   (3,2):13,   (3,3):16  ,
           (4,1):9,    (4,2):7,    (4,3):5   ,
           }
      return I,J,c,d,M
docs: creates example data set 2