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19 7 19 8 19 9 20 0 20 1 20 2 20 3 20 4 20 5 20 6 20 7 20 8 20 9 21 0 21 1 21 2 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993

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