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44 4 44 5 44 6 44 7 44 8 44 9 45 0 45 1 45 2 45 3 45 4 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963

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