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77 13 77 14 77 15 77 16 77 17 77 18 77 19 77 20 77 21 77 22 77 23 7669 7668 7667 7666 7665 7664 7663 7662 7661 7660

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