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88 7 88 8 88 9 89 0 89 1 89 2 89 3 89 4 89 5 89 6 89 7 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989

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