# 2 nodes, one pointing back to itself
[ Ruhleben ] -> [ Aschersleben ]
[ Aschersleben ] -> [ Ruhleben ]
[ Ruhleben ] -> [ Ruhleben ]
# 2 nodes, one pointing back to itself
[ Ruhleben ] -> [ Aschersleben ]
[ Aschersleben ] -> [ Ruhleben ]
[ Ruhleben ] -> [ Ruhleben ]