# bend edges with labels
[ Ahrweiler ] -- Eifel --> [ Lahn ]
[ Lahn ] == Eifel ==> [ Lahnstein ]
[ Lahnstein ] -- Eifel --> [ Ahrweiler ]
# bend edges with labels
[ Ahrweiler ] -- Eifel --> [ Lahn ]
[ Lahn ] == Eifel ==> [ Lahnstein ]
[ Lahnstein ] -- Eifel --> [ Ahrweiler ]