static ItIt<S> ai_dropLeadingAndTrailingAppellations_iterator(S s) {
  final Set<S> phrases = mechSetCI("Appellations");
  ret repeatedInputModificationsIterator(s, func(S s) -> L<ItIt<S>> {
    ai_dropLeadingAndTrailingPhrasesIterators(s, phrases)
  });
}