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Union command for3d objects. region applied on2d .
Union command is used to combine3d solid objects. therefore region command is applied on2d objects.
UNION (Command) Combines two or more3D solids, surfaces, or2D regions into a single
REGION (Command) Converts objects that enclose an area into a2D region object. Regions are2D areas that you create from closed planar loops of objects
