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12 02 12 03 12 04 12 05 12 06 12 07 12 08 12 09 12 10 12 11 12 12 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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