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 | Profile on edges | 
This command allows to copy surface edges. The edges that delimit a surface are its border edges. A volume shape does not have any border edges.
Creation stages / Use:
Select the Profile on edges...command from the "+" of the path field of the Slot and torgue command. It is also available for all other surface commands which needs a profile to be created (Pipe, Swept, Lofted, Normal, Flat, Imprint, ...)
Select the different edges of the face..
Validate by clicking  .
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 | This profile is created "on the fly" during a command use. If this command is canceled or its operation deleted, this profile is also deleted. | 
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 | A solid shape has no boundary edges. Only edges can be used. | 
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| In white and blue: the selected edges. The green spheres : the start and end vertices. | Result |