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53 6 53 7 53 8 53 9 54 0 54 1 54 2 54 3 54 4 54 5 54 6 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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