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81 4 81 5 81 6 81 7 81 8 81 9 82 0 82 1 82 2 82 3 82 4 82 5 82 6 82 7 82 8 82 9 1605 1604 1603 1602 1601 1600 1599 1598 1597 1596 1595 1594 1593 1592 1591

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