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71 5 71 6 71 7 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 1644 1643 1642 1641 1640 1639 1638 1637 1636 1635 1634 1633 1632 1631 1630

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