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60 0 60 1 60 2 60 3 60 4 60 5 60 6 60 7 60 8 60 9 61 0 61 1 61 2 61 3 61 4 61 5 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966

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