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18 24 18 25 18 26 18 27 18 28 18 29 18 30 18 31 18 32 18 33 18 34 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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