static Set<S> allSmartQuestions() {
  Map<Long, O> concepts = safeLoadConcepts("#1005320");
  new TreeSet<S> set;
  for (O ul : valuesOfType(concepts, "main$UserLine")) {
    S q = getString(ul, "text");
    if (nempty(q)) set.add(q);
  }
  ret set;
}