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66 97 66 98 66 99 67 00 67 01 67 02 67 03 67 04 67 05 67 06 67 07 8686 8685 8684 8683 8682 8681 8680 8679 8678 8677

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