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98 5 98 6 98 7 98 8 98 9 99 0 99 1 99 2 99 3 99 4 99 5 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991

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