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76 4 76 5 76 6 76 7 76 8 76 9 77 0 77 1 77 2 77 3 77 4 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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