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87 51 87 52 87 53 87 54 87 55 87 56 87 57 87 58 87 59 87 60 87 61 6690 6689 6688 6687 6686 6685 6684 6683 6682 6681

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