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77 18 77 19 77 20 77 21 77 22 77 23 77 24 77 25 77 26 77 27 77 28 7694 7693 7692 7691 7690 7689 7688 7687 7686 7685

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