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17 68 17 69 17 70 17 71 17 72 17 73 17 74 17 75 17 76 17 77 17 78 17 79 17 80 17 81 17 82 17 83 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985

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