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53 1 53 2 53 3 53 4 53 5 53 6 53 7 53 8 53 9 54 0 54 1 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978

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