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17 50 17 51 17 52 17 53 17 54 17 55 17 56 17 57 17 58 17 59 17 60 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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