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54 0 54 1 54 2 54 3 54 4 54 5 54 6 54 7 54 8 54 9 55 0 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971

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