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15 18 15 19 15 20 15 21 15 22 15 23 15 24 15 25 15 26 15 27 15 28 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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