code: def uses_na_format(station: str) -> bool:
      
      if station[0] in NA_REGIONS:
          return True
      if station[0] in IN_REGIONS:
          return False
      if station[:2] in M_NA_REGIONS:
          return True
      if station[:2] in M_IN_REGIONS:
          return False
      raise BadStation("Station doesn't start with a recognized character set")
docs: Returns True if the station uses the North American format,
      False if the International format