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18 31 18 32 18 33 18 34 18 35 18 36 18 37 18 38 18 39 18 40 18 41 1965 1964 1963 1962 1961 1960 1959 1958 1957 1956

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