static T3<S> ai_webToTriple(Web web) {
  if (web == null) null;
  Collection<WebRelation> l = web_relationObjects(web);
  if (l(l) != 1) null;
  WebRelation r = first(l);
  if (web_countLabels(r.a) != 1 || web_countLabels(r.b) != 1 || web_countLabels(r) != 1) null;
  ret t3(web_text(r.a), web_text(r), web_text(r.b));
}