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53 6 53 7 53 8 53 9 54 0 54 1 54 2 54 3 54 4 54 5 54 6 54 7 54 8 54 9 55 0 55 1 1681 1680 1679 1678 1677 1676 1675 1674 1673 1672 1671 1670 1669 1668 1667

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