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36 66 36 67 36 68 36 69 36 70 36 71 36 72 36 73 36 74 36 75 36 76 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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