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57 4 57 5 57 6 57 7 57 8 57 9 58 0 58 1 58 2 58 3 58 4 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963

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