static LS ai_dropFillers_once(S s) {
  S phrases = mL("Fillers");
  LS tokS = javaTokNPunctuation_cached(s);
  LS tokPhrases = map javaTokNPunctuation_cached(phrases);
  int n = l(tokS);
  new LS out;
  for (int i = 1; i < n; i += 2)
    for (LS tokPhrase : tokPhrases)
      if (codeTokenSubListEqualsIC(tokS, tokPhrase, i))
        // TODO: better punctuation handling
        out.add(trimJoin(withoutSubList(tokS, i, l(tokPhrase)-1)));
  ret out;
}