static L<S> ai_allUnclearLabels() {
  new L<S> out;
  for (WebNode node : indexedNodes("unclear")) {
    WebNode n = web_travelBackwards(node, "is");
    if (n != null && isQuoted(web_text(n)))
      out.add(unquote(web_text(n)));
  }
  ret out;
}