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13 68 13 69 13 70 13 71 13 72 13 73 13 74 13 75 13 76 13 77 13 78 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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