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81 12 81 13 81 14 81 15 81 16 81 17 81 18 81 19 81 20 81 21 81 22 81 23 81 24 81 25 81 26 81 27 9697 9696 9695 9694 9693 9692 9691 9690 9689 9688 9687 9686 9685 9684 9683

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