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12 40 12 41 12 42 12 43 12 44 12 45 12 46 12 47 12 48 12 49 12 50 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960

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