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74 6 74 7 74 8 74 9 75 0 75 1 75 2 75 3 75 4 75 5 75 6 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963

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