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40 6 40 7 40 8 40 9 41 0 41 1 41 2 41 3 41 4 41 5 41 6 41 7 41 8 41 9 42 0 42 1 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965

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