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52 4 52 5 52 6 52 7 52 8 52 9 53 0 53 1 53 2 53 3 53 4 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993

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