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28 9 29 0 29 1 29 2 29 3 29 4 29 5 29 6 29 7 29 8 29 9 30 0 30 1 30 2 30 3 30 4 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975

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