set label of edge at the angle of this edge.
set label of edge at the angle of this edge.

moreover, if two vertices have more than 1 edge allow each edge to have its own label. make sure each labels does not interfere each other.
kidylee/springy,tigerleapgorge/springy,pingjiang/springy,tigerleapgorge/springy,drstarry/springy,shigeruNakajima/springy,dhotson/springy,pingjiang/springy,kidylee/springy,dabobert/springy,dhotson/springy,shigeruNakajima/springy,dabobert/springy