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90 6 90 7 90 8 90 9 91 0 91 1 91 2 91 3 91 4 91 5 91 6 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992

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