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18 18 18 19 18 20 18 21 18 22 18 23 18 24 18 25 18 26 18 27 18 28 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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