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21 76 21 77 21 78 21 79 21 80 21 81 21 82 21 83 21 84 21 85 21 86 3744 3743 3742 3741 3740 3739 3738 3737 3736 3735

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