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11 96 11 97 11 98 11 99 12 00 12 01 12 02 12 03 12 04 12 05 12 06 12 07 12 08 12 09 12 10 12 11 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985

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