ContigousEdge of BRepBuilderAPI_Sewing

Hi all

Is the method ContigousEdge() of BRepBuilderAPI_Sewing means the shared (sewed) edge between two connected faces?

I want to find a shared edge between two connected faces, I use BRepBuilderAPI_Sewing to sew two faces and try to get the shared edge.

The return of NbFreeEdges() and FreeEdge() is correct but the return of NbContigousEdges() and NbMultipleEdges() is zero.

Or anyone with good idea to get the shared edge back?