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15 68 15 69 15 70 15 71 15 72 15 73 15 74 15 75 15 76 15 77 15 78 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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