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67 68 67 69 67 70 67 71 67 72 67 73 67 74 67 75 67 76 67 77 67 78 8611 8610 8609 8608 8607 8606 8605 8604 8603 8602

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