static LS mechListsWithSingleWords() {
  new LS out;
  for (PairS nameAndText : localMechListCopies_iterator()) {
    ItIt<S> it = tlft_iterator(nameAndText.b);
    if (it.hasNext() && !any containsSpaces(it))
      out.add(nameAndText.a);
  }
  ret out;
}