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This is taken from a post made by dgs, it may help.
<LI>Swept Blend - Multiple sections. Section entities can change types (from arc to line for example). I think there needs to be the same number of entities in each section, but that may not be true anymore.
<LI>Variable Section Sweep - Uses a single section, but that section can vary greatly in size and shape along the trajectory. A line will always be a line, but it may grow or shrink in length and change angle. Thank a square to a rectangle to a trapezoid to a parallelogram.
<LI>Constant Section Sweep - Uses a single section that cannot change size or shape. A square is a square is a square at any point along the trajectory. Can be made with the old sweep tool (insert - sweep) or by selecting the 'constant section' pick in the VSS toolas shown above. The latter method gives you the flexibility to change to variable later.</LI>
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