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91 4 91 5 91 6 91 7 91 8 91 9 92 0 92 1 92 2 92 3 92 4 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997

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