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81 80 81 81 81 82 81 83 81 84 81 85 81 86 81 87 81 88 81 89 81 90 7179 7178 7177 7176 7175 7174 7173 7172 7171 7170

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