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74 5 74 6 74 7 74 8 74 9 75 0 75 1 75 2 75 3 75 4 75 5 75 6 75 7 75 8 75 9 76 0 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969

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