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17 79 17 80 17 81 17 82 17 83 17 84 17 85 17 86 17 87 17 88 17 89 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968

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