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18 28 18 29 18 30 18 31 18 32 18 33 18 34 18 35 18 36 18 37 18 38 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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