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27 2 27 3 27 4 27 5 27 6 27 7 27 8 27 9 28 0 28 1 28 2 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964

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