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18 13 18 14 18 15 18 16 18 17 18 18 18 19 18 20 18 21 18 22 18 23 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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