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52 2 52 3 52 4 52 5 52 6 52 7 52 8 52 9 53 0 53 1 53 2 53 3 53 4 53 5 53 6 53 7 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