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17 77 17 78 17 79 17 80 17 81 17 82 17 83 17 84 17 85 17 86 17 87 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966

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