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13 18 13 19 13 20 13 21 13 22 13 23 13 24 13 25 13 26 13 27 13 28 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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