sbool nlLogic_matchRandomFact(NLLogicChecker_v2 c, S pat, NLLogicChecker_v2.Matching m) {
  LS patterns = tok_splitAtVerticalBar(pat);
  LinkedHashMap<S> m2 = null;
  new L<LinkedHashMap<S>> choices;
  for (S fact : c.facts) {
    if (m2 == null) m2 = cloneLinkedHashMap(m.matches);
    bool result = nlLogic_matchMultiplePatterns(c, patterns, fact, m2);
    if (m.verbose) print("matched " + quote(pat) + " with " + quote(fact) + " & " + sfu(m.matches) + " => " + result);
    if (result) {
      choices.add(m2);
      m2 = null;
    }
  }
  if (empty(choices)) false;
  m.matches = random(choices);
  true;
}