Managing the nodes (tiles)  Closed list – the list of nodes that have been selected to be in the interior space  Open list – the list of nodes that are candidates for inclusion in the closed list (on the border)  On each iteration, the nodes on the open list are inspected, and the best candidate is moved to the closed list  This process is repeated until the desired size is achieved  Upon completion, the open list becomes the list of tiles on which to build the wall
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