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67 20 67 21 67 22 67 23 67 24 67 25 67 26 67 27 67 28 67 29 67 30 8676 8675 8674 8673 8672 8671 8670 8669 8668 8667

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