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52 40 4 52 40 5 52 40 6 52 40 7 52 40 8 52 40 9 52 41 0 52 41 1 52 41 2 52 41 3 52 41 4 16990 16989 16988 16987 16986 16985 16984 16983 16982 16981

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