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21 4 21 5 21 6 21 7 21 8 21 9 22 0 22 1 22 2 22 3 22 4 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978

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