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80 8 80 9 81 0 81 1 81 2 81 3 81 4 81 5 81 6 81 7 81 8 81 9 82 0 82 1 82 2 82 3 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978

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