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13 56 13 57 13 58 13 59 13 60 13 61 13 62 13 63 13 64 13 65 13 66 13 67 13 68 13 69 13 70 13 71 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