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13 72 13 73 13 74 13 75 13 76 13 77 13 78 13 79 13 80 13 81 13 82 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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