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12 98 12 99 13 00 13 01 13 02 13 03 13 04 13 05 13 06 13 07 13 08 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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