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18 2 18 3 18 4 18 5 18 6 18 7 18 8 18 9 19 0 19 1 19 2 19 3 19 4 19 5 19 6 19 7 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977

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