Legend
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Description: List all layers' legend of current map. Layers' legends: capital@World
 world@World
ocean_label_1@World
 ocean_label_2@World
continent_common@World
capital@World
 rivers@World
 ocean_label@World
 continent_label@World
 China_boundary_nanhai@World
 lakes@World
 world@World
     world@World
 ocean@World
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