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51 9 52 0 52 1 52 2 52 3 52 4 52 5 52 6 52 7 52 8 52 9 53 0 53 1 53 2 53 3 53 4 53 5 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 9 673 672 671 670 669 668 667 666 665 664 663 662 661 660 659 658 657 656 655 654 653 652 651 650 649 648 647 646 645 644

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