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13 26 13 27 13 28 13 29 13 30 13 31 13 32 13 33 13 34 13 35 13 36 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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