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51 1 51 2 51 3 51 4 51 5 51 6 51 7 51 8 51 9 52 0 52 1 52 2 52 3 52 4 52 5 52 6 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