static S ai_dropDroppableTail(S s) {
  for (WebNode node : ai_search_dollarX_verified("$X", "is", "a droppable tail")) {
    if (isQuoted(web_text(node))) {
      S tail = web_unquote(node);
      if (nempty(tail) && ewic(s, tail)) {
        print("Dropping tail: " + quote(tail));
        ret dropSuffixTrimIC(tail, s);
      }
    }
  }
  ret s;
}