static S ai_answerFromCache(S q) {
  repeat 10 {
    try answer ai_renderNodesList(ai_search_dollarX_verified("$X", "answers", q), null, " or ");
    try answer ai_standardAnswer(q);
    WebNode n = first(ai_search_dollarX_verified(q, "see answer to:", "$X"));
    if (n != null)
      q = web_text(n);
    else
      break;
  }
  null;
}