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55 4 55 5 55 6 55 7 55 8 55 9 56 0 56 1 56 2 56 3 56 4 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978

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