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77 2 77 3 77 4 77 5 77 6 77 7 77 8 77 9 78 0 78 1 78 2 78 3 78 4 78 5 78 6 78 7 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976

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