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87 27 87 28 87 29 87 30 87 31 87 32 87 33 87 34 87 35 87 36 87 37 6689 6688 6687 6686 6685 6684 6683 6682 6681 6680

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