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75 4 75 5 75 6 75 7 75 8 75 9 76 0 76 1 76 2 76 3 76 4 76 5 76 6 76 7 76 8 76 9 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986

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