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30 2 30 3 30 4 30 5 30 6 30 7 30 8 30 9 31 0 31 1 31 2 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987

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