− | Resets all of the structures including the PR Quadtree, clearing them. This has the effect of removing every city. This command cannot fail, so it should unilaterally produce a <success> element in the output XML. | + | Resets all of the structures including the PM Quadtree, clearing them. This has the effect of removing every city. This command cannot fail, so it should unilaterally produce a <success> element in the output XML. |