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51 4 51 5 51 6 51 7 51 8 51 9 52 0 52 1 52 2 52 3 52 4 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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