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71 8 71 9 72 0 72 1 72 2 72 3 72 4 72 5 72 6 72 7 72 8 72 9 73 0 73 1 73 2 73 3 1665 1664 1663 1662 1661 1660 1659 1658 1657 1656 1655 1654 1653 1652 1651

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