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55 5 55 6 55 7 55 8 55 9 56 0 56 1 56 2 56 3 56 4 56 5 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991

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