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89 5 89 6 89 7 89 8 89 9 90 0 90 1 90 2 90 3 90 4 90 5 90 6 90 7 90 8 90 9 91 0 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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