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15 74 15 75 15 76 15 77 15 78 15 79 15 80 15 81 15 82 15 83 15 84 15 85 15 86 15 87 15 88 15 89 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971

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