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60 1 60 2 60 3 60 4 60 5 60 6 60 7 60 8 60 9 61 0 61 1 61 2 61 3 61 4 61 5 61 6 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