static Map<PairS, Int> ai_ruleEngine2_mappingQualities(RuleEngine2.Rule rule) {
  new Map<PairS, Int> map;
  new Matches m;
  for (S s : rule.comments)
    if (match("changing * to * is *", s, m)) {
      int value = eqic($1, "ok") ? 1 : eqic($1, "bad") ? -1 : 0;
      map.put(pair($2, $3), value);
    }
  ret map;
}