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87 6 87 7 87 8 87 9 88 0 88 1 88 2 88 3 88 4 88 5 88 6 88 7 88 8 88 9 89 0 89 1 1645 1644 1643 1642 1641 1640 1639 1638 1637 1636 1635 1634 1633 1632 1631

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