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36 28 36 29 36 30 36 31 36 32 36 33 36 34 36 35 36 36 36 37 36 38 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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