text: from floodsystem.stationdata import build_station_list
  from floodsystem.geo import stations_by_river, rivers_with_station
  
  def run():
      stations = build_station_list()
      y = list(rivers_with_station(stations))
      y.sort()
      print(y[:10])
      x = stations_by_river(stations)
      for each in x.values():
          each.sort()
      print(x["River Aire"]) , print(x["River Cam"]) , print(x["River Thames"])
      print(len(x))
      return None
  
  if __name__ == '__main__':
      run()
  