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28 0 28 1 28 2 28 3 28 4 28 5 28 6 28 7 28 8 28 9 29 0 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979

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