sbool learnedFlexMatch(S pattern, S s, Matches m) {
  if (!flexMatchIC(pattern, dropPunctuation(s), m)) false;
  MatchLearner l = uniq(MatchLearner, +pattern);
  S status = l.examples.get(s);
  if (eq(status, 'rejected)) false;
  if (empty(status))
    l.examples.put(s, 'assumed);
  true;
}