def urbanmain() = {
  import M2._

  import io.Source


  def urban_get_wordle_list(url: String) : List[String] = {
    Source.fromFile(url)("ISO-8859-1").getLines().toList
  }
  val urban_secrets = urban_get_wordle_list("wordle.txt")

  //val urban_wordle_url = """https://nms.kcl.ac.uk/christian.urban/wordle.txt"""
  //val urban_secrets = get_wordle_list(urban_wordle_url)

  assert(frequencies(urban_secrets)('y') == 0.9680234350909651)
  assert(frequencies(urban_secrets)('e') == 0.897286463151403)
  assert(frequencies(urban_secrets)('z') == 0.9933086648165279)
}