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13 23 13 24 13 25 13 26 13 27 13 28 13 29 13 30 13 31 13 32 13 33 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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