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17 52 17 53 17 54 17 55 17 56 17 57 17 58 17 59 17 60 17 61 17 62 17 63 17 64 17 65 17 66 17 67 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