I was going to launch into a discussion of mapping of steeplechase course in non-directed graphs, but then changed my mind when I realised that I don't even understand simple coordinate systems - I didn't want to put Descartes before the horse.
The Spanish government has decided to expel all members of ETA. By making them all leave via a single checkpoint it has effectively put all its Basques in one exit. (Points at Dunx: "Well, he started it!!")