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71 6 71 7 71 8 71 9 72 0 72 1 72 2 72 3 72 4 72 5 72 6 72 7 72 8 72 9 73 0 73 1 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959

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