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81 9 82 0 82 1 82 2 82 3 82 4 82 5 82 6 82 7 82 8 82 9 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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