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17 72 17 73 17 74 17 75 17 76 17 77 17 78 17 79 17 80 17 81 17 82 17 83 17 84 17 85 17 86 17 87 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976

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