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77 11 77 12 77 13 77 14 77 15 77 16 77 17 77 18 77 19 77 20 77 21 7674 7673 7672 7671 7670 7669 7668 7667 7666 7665

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