static int ai_endOfNounPhrase(L<S> tok) {
  int i = 1;
  while (i < l(tok)) {
    S t = get(tok, i);
    if (i+2 < l(tok) && isKnownPhrase(t + " " + tok.get(i+2))) i += 4;
    else if (i == 1 && eqicOneOf(t, "a", "the")) i += 4;
    else if (nounPhraseContinuers().contains(lower(t)) || isAdjective(t) || isNoun(t)) i += 2;
    else break;
  }
  ret i;
}