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Within the context of instances, "wing" can refer to either a member of a series of clustered instances (such as the wings of the Caverns of Time and Tempest Keep), or a section of a single instances (such as Naxxramas' wings). Ulduar has examples of both types of wing: the Ulduar complex has both dungeon wings and a raid wing, and the Ulduar raid instance has several wings.