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15 75 15 76 15 77 15 78 15 79 15 80 15 81 15 82 15 83 15 84 15 85 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963

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