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87 49 87 50 87 51 87 52 87 53 87 54 87 55 87 56 87 57 87 58 87 59 6699 6698 6697 6696 6695 6694 6693 6692 6691 6690

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