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76 7 76 8 76 9 77 0 77 1 77 2 77 3 77 4 77 5 77 6 77 7 77 8 77 9 78 0 78 1 78 2 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979

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