static S ai_renderThingDescriptionWithParts(S s) {
  S what = ai_lookup(s);
  if (what == null) null;
  L<S> parts = ai_partsOf(what);
  if (empty(parts)) ret what;
  new L<S> l;
  for (S part : parts) {
    S value = ai_lookup(print(part + " of " + s));
    S p = dropArticle(part);
    l.add(value != null ? p + "=" + value : "unknown " + p);
  }
  ret what + " with " + textOut_and(l);
}