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51 5 51 6 51 7 51 8 51 9 52 0 52 1 52 2 52 3 52 4 52 5 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987

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