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17 26 17 27 17 28 17 29 17 30 17 31 17 32 17 33 17 34 17 35 17 36 17 37 17 38 17 39 17 40 17 41 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980

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