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77 3 77 4 77 5 77 6 77 7 77 8 77 9 78 0 78 1 78 2 78 3 78 4 78 5 78 6 78 7 78 8 1680 1679 1678 1677 1676 1675 1674 1673 1672 1671 1670 1669 1668 1667 1666

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