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77 0 77 1 77 2 77 3 77 4 77 5 77 6 77 7 77 8 77 9 78 0 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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