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#1
 Rivers@World
 Ocean_Label@World
 Continent_Label@World
 China_Boundary_nanhai@World
 Lakes@World
 world@World#1
    world@World#2
 Ocean@World
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