- I think there are actually 6, though 2 are no longer valid, which still leaves 4 valid ones.
DM/BW-547 Kaiserstuhl (deleted)
OE/VB-404 Schusterstuhl (deleted)
So unless I am much mistaken, the question is wrong.
M1EYP: Seems that way to me too Martyn, as I cannot fault your answer.