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30 5 30 6 30 7 30 8 30 9 31 0 31 1 31 2 31 3 31 4 31 5 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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