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27 8 27 9 28 0 28 1 28 2 28 3 28 4 28 5 28 6 28 7 28 8 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989

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