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12 74 12 75 12 76 12 77 12 78 12 79 12 80 12 81 12 82 12 83 12 84 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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