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79 4 79 5 79 6 79 7 79 8 79 9 80 0 80 1 80 2 80 3 80 4 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid