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27 4 27 5 27 6 27 7 27 8 27 9 28 0 28 1 28 2 28 3 28 4 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985

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