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56 8 56 9 57 0 57 1 57 2 57 3 57 4 57 5 57 6 57 7 57 8 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989

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