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18 21 18 22 18 23 18 24 18 25 18 26 18 27 18 28 18 29 18 30 18 31 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964

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