param: ORIG:  supply :=  # defines set "ORIG" and param "supply"
        GARY   1400
        CLEV   2600
        PITT   2900 ;

param: DEST:  demand :=  # defines "DEST" and "demand"
        FRA     900
        DET    1200
        LAN     600
        WIN     400
        STL    1700
        FRE    1100
        LAF    1000 ;

param cost:
         FRA  DET  LAN  WIN  STL  FRE  LAF :=
   GARY   39   14   11   14   16   82    8
   CLEV   27    9   12    9   26   95   17
   PITT   24   14   17   13   28   99   20 ;