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54 81 54 82 54 83 54 84 54 85 54 86 54 87 54 88 54 89 54 90 54 91 9877 9876 9875 9874 9873 9872 9871 9870 9869 9868

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