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31 4 31 5 31 6 31 7 31 8 31 9 32 0 32 1 32 2 32 3 32 4 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960

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