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15 81 15 82 15 83 15 84 15 85 15 86 15 87 15 88 15 89 15 90 15 91 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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