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54 3 54 4 54 5 54 6 54 7 54 8 54 9 55 0 55 1 55 2 55 3 55 4 55 5 55 6 55 7 55 8 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991

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