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17 9 18 0 18 1 18 2 18 3 18 4 18 5 18 6 18 7 18 8 18 9 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989

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